You don't get pregnant the day after your 2 day period. You can only get pregnant when you ovulate. Immediately after ovulation, the egg begins decaying. So sperm needs to be present as soon as ovulation occurs.
However, sperm can live approximately 5 days, so it is possible that if you have sex after your period that the sperm could live long enough to reach ovulation day, if you ovulated early.
Therefore, if you want to prevent pregnancy, you need to use Birth Control when having sex, since most women do not know when they ovulate and can not predict their ovulation day.
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