In most women, ovulation is around 14 days before menstruation, in the middle of the period, and there is a 3%-5% chance of getting pregnant during intercourse just after menstruation. If you have already had intercourse and don’t want to get pregnant and don’t want to take emergency contraceptives, you can go to the hospital and register for a vaginal ultrasound to rule out if you are ovulating. If it is not, you can consider not to take emergency contraception, but there are a few women who are ovulating at this time, so you should take emergency contraception to be safe and to achieve about 80% of the contraceptive effect. At the same time, in the future life, as far as possible to take condoms for contraception, so as to avoid frequent and repeated oral emergency contraceptive drugs cause irregular menstruation.