1. If you use emergency contraception, it usually contains high progesterone content, which may lead to irregular menstruation. In the second month of oral emergency contraception, menstruation may be delayed, and it is normal to delay menstruation for 7- 10 days.

2. If you use short-acting contraceptives, that is, ordinary daily pills, it is generally a mixture of estrogen and progesterone. In the first few months of taking such drugs, irregular menstruation may occur because the body adapts to the drugs. But as time goes on, most people's menstruation will return to normal. If menstruation is delayed in the second month after taking short-acting contraceptives, it may be because the body is still adjusting itself to drugs.