Menstruation to the first three days of the same room will be pregnant

Menstruation three days before sex will not be pregnant, because women ovulation is 14 days before menstruation, egg cells can only survive 48 hours after discharge, so seven days before menstruation is safe, three days before menstruation is very safe, as long as the menstrual cycle is accurate. If menstruation comes again after 13 days, this time is ovulation period, the probability of pregnancy is very high. If the female menstruation is not accurate, you must use condoms throughout contraception.