, the couple said they thought they'd never have children after suffering the heartbreak of a miscarriage after their first try at IVF last year.
This came after Izzy was also diagnosed with polycystic ovaries in her twenties.
"In an ideal world when you're ready to start a family you hope you will conceive in the first few months of trying," said 29-year-old Harry.
"We were like, no, no we won't need IVF, it won't be us. We thought it would be fine." But the couple revealed that they have been trying to conceive since their wedding in 2012 and it became harder and harder to put a brave face on things, every time they were asked if they wanted to start a family.
"You feel like you are never going to be the ones who get to say, 'We are having a baby'," says Harry.
We were like, 'No, no we won't need IVF, it won't be us. We thought it would be fine."Izzy has been having scans on a regular basis but the couple don't plan to find out the gender of the tot. I've felt like I was having a boy from the start - but how can I possibly know?
The 26-year-old drummer popped the question as the pair enjoyed a romantic meal on the island of St Lucia at the Rendezvous Hotel.
And he couldn’t wait to reveal the good news on Twitter.
Because of this, they turned to IVF to help them start their family together.
Speaking about becoming a father at last, Harry told Hello!