If you don't use contraception when you have sex, you can get pregnant at any time during your menstrual cycle, even while you have your period. You can also get pregnant if you've never had a period before, or if it's your first period or the first time you have sex.
There is no safe time of the month when you can have sex without using contraception and not get pregnant. However, there are times of the month when you're more fertile (likely to get pregnant) than others.
Ovulation (when eggs are released from your
ovaries) usually occurs between 10-16 days before the start of your next period, and this is when you're most likely to get pregnant. You're therefore much less likely to get pregnant if you have sex just after your period has finished, but it's important to remember that sperm can survive in the body for a up to seven days after ejaculation.
If your period lasts seven days, then by the time it's finished you could be just five days away from ovulating again. If you ovulate early, then there will be even less time between the end of your last period and when you're fertile again.
Natural family planning is when a couple uses the woman's menstrual cycle as a form of contraception that is, by not having sex during fertile times. However, this is not a reliable method as sperm can survive for a few days inside the body, and it offers you no protection against sexually transmitted diseases.
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