The first day of intercourse after menstruation without a condom has the possibility of pregnancy. Some women’s menstrual cycle is relatively short, always significantly ahead of the tide or even 21 days, ovulation time accordingly is generally earlier, especially the menstrual time is longer, such as 5-7 days of the case, the first day after menstruation coitus do not do a good job of strict contraceptive measures, the chances of getting pregnant will be relatively large. If a woman’s menstrual cycle is longer, especially if it is more than one month, the chances of getting pregnant without a condom on the first day after menstruation will be relatively small. Especially if the woman’s menstrual period is relatively short, such as only 3 days, the first day after the menstrual period is only the fourth day of menstruation, the chances of getting pregnant without protection are correspondingly small. Whenever you have intercourse without a condom, there is a possibility of pregnancy.