A South African man and his Ukrainian fiancée were detained in Abu Dhabi after a doctor discovered that the woman was pregnant, a relative says.

Emlyn Culverwell, 29, and Iryna Nohai, 27, were reportedly arrested for unlawful sex outside of marriage.

The arrests came after Nohai, who was suffering from stomach cramps, went to Medeor Medical Centre in Yas Mall in Abu Dabi, where a doctor told her she was pregnant.

Having sex outside of marriage is illegal in the UAE, and those who are convicted can face long jail sentences.

The couple have reportedly been detained since January 29, but details of their arrests are just emerging.

Emlyn Culverwell, 29, and Iryna Nohai, 27, were reportedly arrested in the United Arab Emirates for unlawful sex outside of marriage on January 29, just two days after they got engaged

The arrests came after Nohai went to a clinic when she was suffering from stomach cramps and was told she was pregnant. The couple have not, however, been charged because authorities are still investigating how long the couple was sexually active

Culverwell and Nohai were arrested at the hospital for not being able to provide marriage certificates.

They were first taken to Yas Police Station, and then later brought to Al Wathba Prison.

They have not, however, been charged because authorities are still investigating the paternity of the child, how long the couple was sexually active and are testing Nohai's HIV status.

The couple had become engaged just two days before their arrest, on January 27.

Culverwell has been working in the UAE for the past five years as a water rescue operative at Yas Waterworld.

He first started dating Nohai, who worked as an administration officer, in mid-2014.

Culverwell has been working in the UAE for the past five years and first started dating Noahi in 2014

Culverwell's mother said that Nohai was still in the early stages of her pregnancy, and suggested that the cramps could be a sign of a miscarriage

South Africa's foreign ministry said that it cannot help the couple because it is an issue with domestic UAE law, according to News24, and have suggested they seek legal help.

Legal representation for Culverwell and Nohai could cost up to 118‚000 South African rands ($8‚000) per person, Times Live reported.

Culverwell's mother, Linda, said that Nohai was still in the early stages of her pregnancy, and suggested that the cramps could be a sign of a miscarriage.

She has pleaded for their release, saying that 'the only thing they did wrong was fall in love'.

Linda described her son as a health fanatic who didn't smoke, take drugs or drink alcohol.

She told News24 that her family is 'trying to get messages to the two to say we love them and they shouldn't be worried'.

South Africa's foreign ministry said that it cannot help the couple because it is an issue with domestic UAE law

Linda said that since the couple's arrest, family members and friends have been unable to contact them.

She said that the only people who can visit the couple are family members who share the same last name, and relatives are currently calculating the costs of making a trip to Abu Dhabi with lawyers.

Since their arrest, a Christian Church in Yas Island, UAE offered to marry the couple for a lofty price, but a judge refused to allow it, according to Herald Live.

Nohai is guilty of 'Zina', the Islamic legal term referring to unlawful sexual intercourse, which the UAE has criminalized.

Women and couples found guilty of Zina in UAE, women and couples are either deported or imprisoned in the country for at least a year.

Hundreds of women are imprisoned each year for the crime, including pregnant women and rape victims.