Fertility basics
The fertile window is roughly the five days before ovulation and the day of ovulation itself, because sperm can survive for several days while an egg survives for about a day. NICE advises sex every two to three days rather than timing it precisely, to reduce pressure.
Related United Kingdom guides
Last reviewed: 23 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.