Midwife Victoria Oldfield checks the heartbeat of Laura Finney's unborn baby on the Antenatal Ward at the Lancashire Women and Newborn Centre at Burnley General Hospital in East Lancashire, following the outbreak of the coronavirus disease (COVID-19), in Burnley, Britain May 15, 2020. Picture taken May 15, 2020. REUTERS/Hannah McKay/Pool

Antenatal Ward Manager Rachel Thorpe checks on Clare Glynn whilst she uses a birthing ball during the early stages of labour on the Antenatal Ward at the Lancashire Women and Newborn Centre at Burnley General Hospital in East Lancashire, following the outbreak of the coronavirus disease (COVID-19), in Burnley, Britain May 15, 2020. Picture taken May 15, 2020. REUTERS/Hannah McKay/Pool

A sign shows directions for NHS North Middlesex Hospital at the Tottenham Hotspur stadium after Tottenham Hotspur have begun to offer maternity and antenatal services as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 14, 2020. REUTERS/Hannah McKay

A sign shows directions for NHS North Middlesex Hospital at the Tottenham Hotspur stadium after Tottenham Hotspur have begun to offer maternity and antenatal services as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 14, 2020. REUTERS/Hannah McKay

A sign shows directions for NHS North Middlesex Hospital at the Tottenham Hotspur stadium after Tottenham Hotspur have begun to offer maternity and antenatal services as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 14, 2020. REUTERS/Hannah McKay

Actor Natalie Portman, who is pregnant and portrays Jacqueline Kennedy, poses at a screening of "JACKIE" as a part of AFI Fest in Los Angeles, California, U.S. November 14, 2016. REUTERS/Danny Moloshok

Actor Natalie Portman, who is pregnant and portrays Jacqueline Kennedy, poses at a screening of "JACKIE" as a part of AFI Fest in Los Angeles, California, U.S. November 14, 2016. REUTERS/Danny Moloshok

Actor Natalie Portman (L), who is pregnant and portrays Jacqueline Kennedy, reacts next to director Pablo Larrain (R) as she sees other co-stars at a screening of "JACKIE" as a part of AFI Fest in Los Angeles, California, U.S. November 14, 2016. REUTERS/Danny Moloshok

Actor Natalie Portman, who is pregnant and portrays Jacqueline Kennedy, poses at a screening of "JACKIE" as a part of AFI Fest in Los Angeles, California, U.S. November 14, 2016. REUTERS/Danny Moloshok

Actor Natalie Portman, who is pregnant and portrays Jacqueline Kennedy, poses at a screening of "JACKIE" as a part of AFI Fest in Los Angeles, California, U.S. November 14, 2016. REUTERS/Danny Moloshok

Actor Natalie Portman, who is pregnant and portrays Jacqueline Kennedy, poses at a screening of "JACKIE" as a part of AFI Fest in Los Angeles, California, U.S. November 14, 2016. REUTERS/Danny Moloshok

Actor Tori Spelling, who is pregnant, poses at the world premiere of Walt Disney Animation Studios' "Moana" as a part of AFI Fest in Hollywood, California, U.S., November 14, 2016. REUTERS/Danny Moloshok

Revolutionary Armed Forces of Colombia's (FARC) Tatiana, 36-year-old and six months pregnant, sits next to her husband and gifts for the baby at a camp where the FARC will ratify a peace deal with the Colombian government, near El Diamante in Yari Plains, Colombia, September 17, 2016. Picture taken September 17, 2016. REUTERS/John Vizcaino

Revolutionary Armed Forces of Colombia's (FARC) Tatiana, 36-year-old and six months pregnant, sits next to gifts for the baby at a camp where the FARC will ratify a peace deal with the Colombian government, near El Diamante in Yari Plains, Colombia, September 17, 2016. Picture taken September 17, 2016. REUTERS/John Vizcaino

Armie Hammer and his wife Elizabeth Chambers arrive on the red carpet for the film "Free Fire" during the 41st Toronto International Film Festival (TIFF), in Toronto, Canada, September 8, 2016. REUTERS/Mark Blinch

Armie Hammer and his wife Elizabeth Chambers arrive on the red carpet for the film "Free Fire" during the 41st Toronto International Film Festival (TIFF), in Toronto, Canada, September 8, 2016. REUTERS/Mark Blinch

Armie Hammer and his wife Elizabeth Chambers arrive on the red carpet for the film "Free Fire" during the 41st Toronto International Film Festival (TIFF), in Toronto, Canada, September 8, 2016. REUTERS/Mark Blinch

Armie Hammer and his wife Elizabeth Chambers arrive on the red carpet for the film "Free Fire" during the 41st Toronto International Film Festival (TIFF), in Toronto, Canada, September 8, 2016. REUTERS/Mark Blinch

Armie Hammer and his wife Elizabeth Chambers arrive on the red carpet for the film "Free Fire" during the 41st Toronto International Film Festival (TIFF), in Toronto, Canada, September 8, 2016. REUTERS/Mark Blinch

Madeline Luis, 38, pregnant with her 12th child gestures as she is seen at a displaced persons camp protected by U.N. peacekeepers in Wau, South Sudan, September 4, 2016. Picture taken September 4, 2016. REUTERS/Michelle Nichols

Laura Perlongo and Nev Schulman arrive at the 2016 MTV Video Music Awards in New York, U.S., August 28, 2016. REUTERS/Eduardo Munoz

Laura Perlongo and Nev Schulman arrive at the 2016 MTV Video Music Awards in New York, U.S., August 28, 2016. REUTERS/Eduardo Munoz

Laura Perlongo and Nev Schulman arrive at the 2016 MTV Video Music Awards in New York, U.S., August 28, 2016. REUTERS/Eduardo Munoz

Laura Perlongo and Nev Schulman arrive at the 2016 MTV Video Music Awards in New York, U.S., August 28, 2016. REUTERS/Eduardo Munoz

U.S. Democratic presidential nominee Hillary Clinton speaks with a pregnant woman during a visit to Borinquen Health Care Center in Miami, Florida August 9, 2016. Clinton was on hand to speak about the Zika virus. REUTERS/Chris Keane

Cast member Terrence Howard touches the belly of his wife Miranda Pak at a special event for the television series "Empire" in Los Angeles, U.S., May 20, 2016. REUTERS/Mario Anzuoni

Cast member Taraji P. Henson touches the belly of Miranda Pak, wife of co-star Terrence Howard, at a special event for the television series "Empire" in Los Angeles, U.S., May 20, 2016. REUTERS/Mario Anzuoni

Actress Emily Blunt arrives at the Metropolitan Museum of Art Costume Institute Gala (Met Gala) to celebrate the opening of "Manus x Machina: Fashion in an Age of Technology" in the Manhattan borough of New York, May 2, 2016. REUTERS/Lucas Jackson

Actress Olivia Wilde arrives at the Metropolitan Museum of Art Costume Institute Gala (Met Gala) to celebrate the opening of "Manus x Machina: Fashion in an Age of Technology" in the Manhattan borough of New York, May 2, 2016. REUTERS/Eduardo Munoz

Actress Olivia Wilde arrives at the Metropolitan Museum of Art Costume Institute Gala (Met Gala) to celebrate the opening of "Manus x Machina: Fashion in an Age of Technology" in the Manhattan borough of New York, May 2, 2016. REUTERS/Eduardo Munoz

Andreza Maiara Soares (R), who is four months pregnant, bathes her son Andre Felipe in her house at a slum in Recife, Brazil, March 2, 2016. REUTERS/Ueslei Marcelino

Andreza Maiara Soares, who is four months pregnant, is seen at her house at a slum in Recife, Brazil, March 2, 2016. REUTERS/Ueslei Marcelino

Andreza Maiara Soares, who is four months pregnant, is seen at her house at a slum in Recife, Brazil, March 2, 2016. REUTERS/Ueslei Marcelino

Andreza Maiara Soares (C), who is four months pregnant, is seen in front of her house at a slum in Recife, Brazil, March 2, 2016. REUTERS/Ueslei Marcelino

Andreza Maiara Soares (C), who is four months pregnant, is seen at her house at a slum in Recife, Brazil, March 2, 2016. REUTERS/Ueslei Marcelino

Singer John Legend and wife Chrissy Teigen arrive at the 88th Academy Awards in Hollywood, California February 28, 2016. REUTERS/Lucy Nicholson
TPX IMAGES OF THE DAY

Adilma de Oliveira, 29, who is eight months pregnant, poses at her house's backyard in Congo, Brazil, February 16, 2016. Picture taken on February 16, 2016. REUTERS/Ricardo Moraes

Adilma de Oliveira, 29, who is eight months pregnant, stands in front of her house in Congo, Brazil, February 16, 2016. Picture taken on February 16, 2016. REUTERS/Ricardo Moraes

Adilma de Oliveira, 29, who is eight months pregnant, stands in the bedroom prepared for her baby, at her house in Congo, Brazil, February 16, 2016. Picture taken on February 16, 2016. REUTERS/Ricardo Moraes

Daniele Kelly (L), 31, who is seven months pregnant, talks with her daughter Mayra, 11, inside their stilt house, a lake dwelling also known as palafitte or 'Palafito', in Recife, Brazil, February 6, 2016. Picture taken February 6, 2016. To match HEALTH-ZIKA/CHURCH REUTERS/Nacho Doce

Model Chrissy Teigan and musician John Legend arrive at the 58th Grammy Awards in Los Angeles, California February 15, 2016. REUTERS/Danny Moloshok

Model Chrissy Teigen arrives at the 58th Grammy Awards in Los Angeles, California February 15, 2016. REUTERS/Danny Moloshok

Model Chrissy Teigan and musician John Legend arrive at the 58th Grammy Awards in Los Angeles, California February 15, 2016. REUTERS/Danny Moloshok

Patricia Araujo (L), 23, who is seven-months pregnant, stands next to children as they pose in front of their stilt house, a lake dwelling also known as palafitte or 'Palafito', in Recife, Brazil, February 8, 2016. The Zika virus may be particularly adept at entrenching itself in parts of the body that are shielded from the immune system, making it harder to fight off and possibly lengthening the timeframe in which it can be transmitted, top U.S. experts said on Friday. Picture taken February 8, 2016. REUTERS/Nacho Doce TPX IMAGES OF THE DAY

Republican U.S. presidential candidate Donald Trump is accompanied by his pregnant daughter Ivanka as he addresses supporters at the Verizon Wireless Arena during a campaign event in Manchester, New Hampshire, February 8, 2016. REUTERS/Rick Wilking

Republican U.S. presidential candidate Donald Trump speaks with his pregnant daughter Ivanka as he addresses supporters at the Verizon Wireless Arena during a campaign event in Manchester, New Hampshire, February 8, 2016. REUTERS/Rick Wilking

Patricia Araujo, 23, who is seven months pregnant, stands in front of her stilt house, a lake dwelling also known as palafitte or 'Palafito', in Recife, Brazil, February 8, 2016. Zika, spreading rapidly in South and Central America and the Caribbean, has been linked to severe birth defects in Brazil, and public health officials' concern is focused on pregnant women and women who may become pregnant. REUTERS/Nacho Doce

Daniele Kelly (L), 31, who is seven months pregnant, talks with neighbours at the entrance of her house in a slum of Recife, Brazil, February 7, 2016. REUTERS/Nacho Doce

Luciele Souza, 23, who is nine months pregnant, stands at the entrance of her house in a slum of Recife, Brazil, February 7, 2016. REUTERS/Nacho Doce

Tainara Lourenco, 21, who is five months pregnant, sits on the stairs inside the house of a relative in a slum of Recife, Brazil, February 7, 2016. REUTERS/Nacho Doce

Luciele Souza, 23, who is nine months pregnant, stands at the entrance of her house in a slum of Recife, Brazil, February 7, 2016. REUTERS/Nacho Doce

Tainara Lourenco, 21, who is five months pregnant, sits on the stairs inside the house of a relative in a slum of Recife, Brazil, February 7, 2016. REUTERS/Nacho Doce TPX IMAGES OF THE DAY

Daniele Kelly, 31, who is seven months pregnant, turns on the cooker next to her son Gabriel, 5, inside of their stilt house, a lake dwelling also known as palafitte or 'Palafito', in Recife, Brazil, February 6, 2016. The Zika virus, linked to thousands of birth defects in Brazil, is primarily transmitted through mosquito bites, but word surfaced this week of infections through sex and blood transfusions. REUTERS/Nacho Doce

Daniele Kelly, 31, who is seven months pregnant, looks at food next to the bathroom (R) inside her stilt house, a lake dwelling also known as palafitte or 'Palafito', in Recife, Brazil, February 6, 2016. The Zika virus, linked to thousands of birth defects in Brazil, is primarily transmitted through mosquito bites, but word surfaced this week of infections through sex and blood transfusions. REUTERS/Nacho Doce

Daniele Kelly, 31, who is seven months pregnant, unpegs dried laundry at the entrance of her stilt house, a lake dwelling also known as palafitte or 'Palafito', in Recife, Brazil, February 6, 2016. The Zika virus, linked to thousands of birth defects in Brazil, is primarily transmitted through mosquito bites, but word surfaced this week of infections through sex and blood transfusions. REUTERS/Nacho Doce

Mayra, 11, kisses her mother Daniele Kelly, 31, who is seven months pregnant, inside their stilt house, a lake dwelling also known as palafitte or 'Palafito', in Recife, Brazil, February 6, 2016. The Zika virus, linked to thousands of birth defects in Brazil, is primarily transmitted through mosquito bites, but word surfaced this week of infections through sex and blood transfusions. REUTERS/Nacho Doce

Daniele Kelly, 31, who is seven months pregnant, poses at the entrance of her stilt house, a lake dwelling also known as palafitte or 'Palafito', in Recife, Brazil, February 6, 2016. The Zika virus, linked to thousands of birth defects in Brazil, is primarily transmitted through mosquito bites, but word surfaced this week of infections through sex and blood transfusions. REUTERS/Nacho Doce TPX IMAGES OF THE DAY

Henrique kisses his wife Paula, who is seven months pregnant, during an annual block party known as "Eu Acho e pouco" (I think it is little) one of the many carnival parties to take place in the neighbourhoods of Olinda, Brazil February 6, 2016. REUTERS/Ueslei Marcelino

Noriany Rivera, who is 40 weeks pregnant, looks at her belly as she listens to a doctor during a routine check up, as fliers explaining how to prevent Zika, Dengue and Chikungunya viruses are posted on the wall, at a public hospital in San Juan, Puerto Rico, February 3, 2016. REUTERS/Alvin Baez

Kaitie Resende, who is seven months pregnant, pose for a photo outside her home in Vila Canoas slum in Rio de Janeiro, Brazil, February 2, 2016. REUTERS/Pilar Olivares