The actor has revealed she froze her eggs after being diagnosed with endometriosis.
After 16 years of IVF and 18 miscarriages Louise Warneford is now mum to William and has written a book about her heartbreaking journey.
The new guidelines - brought into force because of coronavirus disruption - also apply to frozen sperm and embryos.
The singer suffers from a condition called endometriosis, which affects approximately 10% of women worldwide.
Men who drank alcohol three months before conception had a 44% raised risk of the baby being born with congenital heart disease.
"For everyone going through infertility and conception hell, please know it was not a straight line to either of my pregnancies."