You're most fertile at the time of ovulation (when an egg is released from your ovaries), which usually occurs 12 to 14 days before your next period starts. This is the time of the month when you're most likely to get pregnant. It's unlikely that you'll get pregnant just after your period, although it can happen. It's important to remember that sperm can sometimes survive in the body for up to 7 days after you have sex. slezih it may be possible to get pregnant soon after your period finishes if you ovulate early, especially if you have a naturally short menstrual cycle. so its better for you to use contraceptives wheather is barrier or hormonal(condoms weym pills malet new)