Most of the bleeding during breastfeeding is menstruation. Before 6 months after delivery, irregular vaginal bleeding may occur due to the increase of lactogen level in the body, and ovulation is irregular at this time. By 6 months after delivery, the gonadal axis is basically back to normal, and at this time, as long as there is regular menstruation, there is normal ovulation. However, some people may ovulate once before they have their period, so if you are not careful, you may become pregnant. If you don’t want to get pregnant, you should always use effective birth control while breastfeeding. Some people feel that if they don’t get their period, they won’t get pregnant, but this is not true, because most people have a normal ovulation before they get their period, so if they have intercourse at the time of ovulation and don’t use contraception, they will easily get pregnant.