Love Island's Amy Hart says her pregnancy was "100 per cent unplanned" after spending £12,000 on fertility treatment.
The former ITV2 villa star made the decision to freeze her eggs before conceiving naturally with her partner of 18 months, Sam Rason.
She announced the good news live on Loose Women but has since taken to an Instagram Q&A session to go into more detail on how she conceived.
Speaking with her 1.1million followers, the 30-year-old detailed her plans for a big family.
Admitting the surprise, she said: "This was a 100 per cent unplanned pregnancy, turns out everyone telling me tracking my cycle isn't actually a 100 per cent form of contraception was indeed correct."
Fans then asked the reality star what she will do with the eggs that she froze.
Amy replied: "Use them for 2nd/3rd/4th if we need to, if we don't, donate them! It was never an issue with falling pregnant, it was more the longevity of my fertility."
"For example my Prof said I had 2-3 years of good fertility left so I froze the higher quality, younger eggs," she added - all before revealing her plans for her "huge" family.
Speaking openly about her plans to adopt and have a child of her own before meeting Sam, she said: "I've always wanted a huge family and my absolute dream would be to start fostering and adopting in my 40s.
"I was happy to have a baby on my own and would have started solo IVF this November had I not met Sam! I think because I was chilled and not panicking that I met Sam!"
Fans probed Amy about her short relationship with Sam, asking if she was worried.
"Not at all! We were talking about this the other night actually," she said. "I feel like we've crammed 4/5 years of a relationship into the 18 months we've been together.
"Lots of travel, lots of fun experiences, learning to live with each other's habits. When IS the right time anyway?
"I feel like sometimes people are like 'if we haven't broken up in X years we'll move to the next level', don't live in fear people. Also we both knew quite early on this was a long-term thang."
It comes after the former air hostess revealed her concerns about her body changing after pregnancy following her issues with fertility.
Speaking to OK! magazine about the changes, she said: "I'm more scared about afterwards. Friends have said it takes a year for your bones to go back and they couldn’t run for a year because they'd had a prolapse, so I'm slightly worried about that."
Amy's baby is due between February 28 and March 9 and once she gives birth, she has around 18 months until she ties the knot with beau Sam.
"I've got 18 months before the wedding to get really thin again," she added. "I'm going to try to do Love Island-thin but I don’t know if I can.
"I do worry about postnatal depression too, as I have suffered from anxiety before.
"But I've had therapy and I've got really good coping mechanisms, and I can recognise where I need help. So as much as I'm wary of it, I know that I would notice the signs, hopefully."
