But she said his arrival came as a complete surprise to her and her family, from Llantwit Major, Wales - adding that she had worked ten hour shifts right up until the birth and had even ran a half marathon half way through her pregnancy.
She said looking back the only inkling that she may have been pregnant was a sudden fondness for Mars bars, and 'putting on a stone around Christmas time.'
Hours before the birth, Miss Rzepka had been at work at the Filco supermarket in Cowbridge and said she felt unwell.
She said her manager asked her if she wanted to go home early but she insisted on carrying on until the end of her ten-hour shift.
That night she woke at about 1am in pain.
She said: 'I was having a really sharp pain in the side of my stomach all day and I didn’t know what it was.
'The only way I can describe it is that it was like someone stabbing me in the right hand side of my groin.
'I didn’t think much of it.
At about 5am I felt like I needed the toilet but I couldn’t go.
'I had another really sharp pain at about 5.20am and went to the toilet again.
I stood up because I didn’t feel right.
'I just pushed and he arrived.
I caught him before he went into the toilet.
'I was really shocked.'
Miss Rzepka said: 'My first words were just repeating: "Oh my God".
I didn’t know what else to say. I burst into tears and sat on the floor.'
'My mum said: "It’s a baby"and my dad was saying, "Don’t worry, keep calm".'
Miss Rzepka, who has been working at the deli counter at Filco for nine years, said she had been lifting 25 kilo boxes all the way through the pregnancy, right up until she had the baby.
She added: 'A few days before I had the baby I was lifting up bags of potatoes for the customers.'
Miss Rzepka’s partner Paul, a 29-year-old bar manager who she met just over a year ago at her sister’s hen party, was also none the wiser about her being pregnant.
'I thought, oh no, he will kill me, so I said to my mum to ring him.
He was over the moon about it. Gaynor said: 'I didn’t have any signs, no morning sickness, no pain, no heartburn, nothing at all.
I had periods all the way through. 'I didn’t really put on very much weight until Christmas, and I just thought that was a Christmas belly.' She said she had been 12st until Christmas when she put on another 13Ibs.'
Miss Rzepka had even ran the Cardiff Half Marathon five months into her pregnancy.
New grandmother Tania, 53, who also works at Filco, said: 'I had been up with Gaynor all night.
I thought she had grumbling appendix.
'I was sat on the settee watching the Winter Olympics and the next thing I knew she ran up to the toilet.
'When I heard her scream I ran up the stairs, and half way up the stairs I heard the baby scream.
I just thought, "Oh my God, that’s a baby".
'I saw the baby and my maternal instinct kicked in.
I put my arms out, took the baby and wrapped it in a towel.
'Then helped sit her down and wrap her up.
She was quite white as she had gone into shock.'
She said she had 'no inkling at all' that her daughter was pregnant.
See more pics @ : http://www.gistmelove.com/2014/03/photos-new-mother-who-had-no-idea-she.html
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