You're most fertile within a day or two either side of an egg being released from your ovaries (ovulation).
But you can get pregnant if you have sex at any point during the week before ovulation, as sperm can live inside a woman's body for up to 7 days.
If you're hoping to get pregnant, you do not need to specifically plan sex around this time, though.
It can be difficult to work out exactly when you ovulate. Trying to have sex to a schedule can cause unnecessary stress and anxiety, and may mean you actually end up having less sex.
For the best chance of getting pregnant, have sex every 2 or 3 days throughout your cycle.
Page last reviewed: 2 May 2019
Next review due: 2 May 2022