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14 days before due date of next cycle i.e, date of ovulation Sperm have fertilizing power up to 48 hours once they have entered the female vagina, to achieve pregnancy
intercourse must be done on the days when woman feels sensation of slipperiness at the vaginal opening and the mucus has a stretchy, clear appearance of egg-white, or when the sensation of slipperiness is present and little bit or no mucus is seen at the vulva
.life span of ova after release is between 12 -48 hours.
Wish you good health