Is it possible to conceive outside of the fertile window?

While the chances of conception are highest during the fertile window, it is still possible to conceive outside this timeframe, although the likelihood is significantly lower. Sperm can live in the female’s body for up to five days. On the other hand, the egg can remain viable for up to 24 hours after ovulation. However, the probability of successful fertilisation decreases the further away from the fertile window.