“I had friends who were going through IVF and I knew how traumatic that whole journey could be. I didn’t think I had it in me to go through that.
“Frank and I had a great life, we went out a lot, travelled and I had a lot of focus on his children – not being a replacement mother, but a friend.”
The football manager shares daughters Luna, 15, and Isla, 13 with his former partner, Spanish model Elen Rivas.
Despite fears she may not be able to conceive, Christine fell pregnant in 2018.
She added: “One day [in 2018], I thought I’d missed my period, did a test and saw this positive line.