A MAN who called emergency services because his fiancee was having severe stomach cramps had no idea he was about to become a dad.

Gareth Williams, from Pontnewynydd in South Wales, called for an ambulance recently when his partner Rhiannon Oldham was struck down by extreme pain.

The pair had no idea Ms Oldham was pregnant — instead, they thought she had simply gained a few kilograms over the Christmas period.

While speaking with emergency services over the phone, a panicked Mr Williams insisted his fiancee was not pregnant, and that a “large lump” seemed to be coming out of her.

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“She’s in a lot of pain, it’s like she’s trying to give birth to something but she’s not pregnant,” Mr Williams told operator Chelsie Holbrook.

“She’s actually got this large lump coming out, it’s just coming out. She’s not pregnant.”

But just a few moments later, Mr Williams finally realised what was going on.

“Oh no. No, she’s actually giving birth,” Mr Williams said.

“What do I do? The baby is crying and moving and everything.”

Ms Holbrook immediately sent a midwife to the couple’s home, but their first son, Phillip Alan, had already arrived safely, weighing around 2.2kg.

Ms Holbrook told Wales Online Phililip’s birth was one of the most dramatic she’d encountered during her career.

“The alarm bells started to ring for me when Gareth said that Rhiannon had a large lump and before we knew it she had actually given birth,” she said.

“The adrenaline was well and truly pumping at that point.

“I’ve delivered five babies in my time as a call handler and this one’s definitely up there in terms of the most dramatic.”

Despite the shock arrival of their first child, Mr Williams and Ms Oldham told ITV News they were “over the moon” to suddenly become parents.

The couple, who got engaged on Valentine’s Day, are now back at home with their son.

“It was a huge shock because we had absolutely no idea that she was pregnant,” Mr Williams told the news program.

“The last couple of weeks have been a blur,” Ms Oldham added.

“One minute we were planning for a wedding — now we’re planning for a nursery.”

alexis.carey@news.com.au