Every month, hormonal changes in a woman’s body cause an egg to be released from the ovaries. This egg travels into the fallopian tubes, which connect the ovaries to the uterus (womb). This is called ovulation.
You’re most likely to get pregnant if you have sex within a day or so of ovulation. Ovulation usually happens about 14 days after the first day of your last period.
An egg lives for about 12-24 hours after it’s released. For you to get pregnant, a sperm must fertilise the egg within this time. Sperm can live for up to seven days inside your body, which means an egg is often fertilised by sperm that entered the body before the egg was released.
Learn more about the monthly cycle and pregnancy in When can I get pregnant?
Sex and pregnancy
If you’re hoping to get pregnant, having sex every two or three days throughout the month will give you the best chance.
You don’t need to time sex around ovulation. Trying to do this can be stressful, and being stressed may mean you have less sex.
“Some people buy special kits, or use temperature charts, to try to monitor when they’re ovulating,” says Professor Ledger.
“But temperature charts can be hard to keep and aren’t always reliable. Both kits and charts can cause unnecessary anxiety without being much use.
“Knowing your exact day of ovulation is only useful if you want to time intercourse to the day. Aim for less stress and more fun. After all, it should be a happy time.”