If you were my patient, I would advise you that the egg is released and remains fertile for about 24 hours. Sperm can live approximately 3 days in the female reproductive tract. That leaves a window of about three days during which a woman can conceive during a given cycle. To answer your other question--yes you can get pregnant before you ovulate (because the sperm hang around) but no you can't get pregnant more than 24-36 hours after ovulation.
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