Stacey, 28, shares her true real story:
My new boyfriend, Brian, arrived at my house with a Chinese takeaway in one hand and a bottle of Merlot in the other.
"Perfect," I beamed, heading to the kitchen to grab glasses.
We'd been dating for just a few weeks after meeting in the charity shop where I worked.
He made me laugh until my belly hurt and I felt like things might get serious between us.
So after a couple of glasses of wine, I decided to be honest with him.
"I can't have children," I said.
I'd been diagnosed with polycystic overian syndrome when I was 15 and I'd gone through an early menopause.
"The doctor said it'd be impossible for me to conceive," I said, sadly. "I'll understand if you don't want to see me anymore."
"Don't worry, Stacey, it's you I want," he said.
I was so relieved.
Brian stayed over that night, and after that he never left.
I was so happy.
But as time passed, I began to worry that my inability to have children might drive Brian away in the end.
"Are you sure it doesn't bother you?" I asked, feeling insecure.
"Of course not," he said. "If I wanted someone pregnant, I could get them pregnant."
It was such an odd thing to say, I burst out laughing.
There was no way even Brian the Babymaker could pull off that little miracle with me.
A few weeks later, Brian was away with family when I started to feel sick.
Three of my workmates were pregnant and they all kept complaining about how sore their boobs were.
Suddenly, I realised mine felt sore too!
I couldn't be, could I?
Next day, I took a pregnancy test and to my absolute shock, it was positive.
To me, it was a miracle.
But what on earth was Brian going to say?
When he was back in town, I called him.
"Can you please come round?" I said."There's something I need to tell you."
"You're pregnant, aren't you?" he said, sounding shocked.
"Yes!" I squealed, expecting him to be gushing with excitement too.
But there was only silence.
A realisation was dawning - maybe he'd actually been pleased I couldn't have kids.
Or maybe he wasn't as in love as I was.
"Look Brian," I told him.
"This is the baby that doctors told me I could never have.
I'd love you to be a part of our lives, but if you don't, I'll understand."
I didn't hear from him for two weeks.
The joy of being a mother was wrecked by facing life as a single parent.
Then he turned up at my door.
"I'm so sorry.
It was a shock but I'd like to be there for you and the baby."
After that things were great.
But one night when I was about four months gone I was in bed with Brian when his phone beeped with a text.
I picked it up and saw that there was a message from a woman called Jennifer on the screen.
Brian had a sister called Jennifer but the message was explicit - definitely not something sent between a brother and sister!
I felt sick.
Who was she?
Was Brian going behind my back?
He was still asleep so I decided to figure out what was going on.
I went to his Facebook page and found he'd spent a lot of time messaging a woman named Jennifer who was definitely not his sister.
"Who is Jennifer?" I demanded after he woke up.
"My sister," he said.
"No," I replied, pointing at the Facebook profile. "This Jennifer."
"She's just a friend," he said.
He hadn't even seemed shocked that I was asking, so maybe he was telling the truth.
Plus, I was pregnant and I didn't want to rock the boat, so I left it.
But after that, he deleted Jennifer as a friend and put a passcode on this phone.
He was by my side as I gave birth to our little boy, Diarmuid.
But when our bub was two months old, I received a message on Facebook.
It was from Jennifer.
I'd put some baby clothes for sale on Facebook and she was enquiring about a coat.
I realised she must be pregnant and an awful thought occurred to me.
What if Brian's the father?
It didn't help that he'd been acting strange again.
It seemed all we did was argue.
One day, we were walking through town and passed a woman with a pram.
It was Jennifer. "Hi," Brian said, without stopping.
I looked at his face.
Not a flicker of emotion.
Relief flooded through me.
No father could walk past his own child without acknowledging it.
But it didn't help things at home.
He'd disappear for days at a time.
"If you can't change, get out," I said.
And just like that, he left.
Two months later, I got a text message from Jennifer.
"Stop messaging Brian, it's stressing him out," she said.
I'd only messaged him about his son.
But seeing as Jennifer had contacted me, I decided to ask her to tell me the truth.
My jaw dropped at her reply.
"He told me he was seeing someone else but it was only casual. I had no idea until saw you were pregnant and I was devastated. But then I got pregnant too."
Post continues after video: wife confronts cheating husband on camera
I was so hurt.
He wasn't kidding when he'd boasted he could get any woman pregnant.
A week later, he finally had the guts to answer my call.
"Sorry," was all he said.
Now, as far as I'm concerned, Jennifer is welcome to him.
I'm so much better off without him, but I don't regret the relationship.
Without it, I wouldn't have my miracle baby.
When Take 5 contacted Brian he declined to comment.
Jennifer's name has been changed.