Although there are a number of days in the month when you are more fertile, there has not been a lot of high-quality research into whether timing sex around the 'fertility window' increases your chances of pregnancy. Having regular, unprotected sex every 2 to 3 days without contraception will give you the best chance of success. More than 9 out of 10 couples will get pregnant within two years. If you find that regular sex is too stressful or if you are unable to do it for other reasons, working out the time you are most likely to be fertile in the month makes sense.
However, sperm can survive for longer within the genital tract your vagina, uterus or fallopian tubes.
For the best chance of getting pregnant, you need to get your eggs and your partner's sperm together as often as possible. More than 8 out of 10 couples where the woman is aged under 40 will get pregnant within one year if they have regular unprotected sex. More than 9 out of 10 couples will get pregnant within two years. Having vaginal sex every 2 to 3 days will give you the best chance of getting pregnant.
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