Many women complain that the COVID vaccine has disrupted their menstrual cycle, while some women have late periods, some report heavy bleeding. found that any possible change in the menstrual cycle after the COVID vaccination is only short-term and does not affect fertility. Of the women who reported changes, those using long-acting hormonal contraceptives, gender-affirming hormones, and postmenopausal women, all reported delayed periods or breakthrough bleeding.
Some women reported late periods, others early periods, some heavy bleeding and also lighter bleeding. There were a large number of women who reported no change.