For women who are sexually active and are not using contraception, if your period is delayed, the first thing to do is to rule out pregnancy. If there is no pregnancy, then you can take further medication or injections to induce menstruation. Nowadays, we usually take progesterone injection, after a few days after stopping the medicine, usually in 3-7 days after stopping the medicine, menstruation will come. This phenomenon is a hormonal withdrawal of bleeding to produce menstruation, but this is the case for women of childbearing age. If you are already pregnant, this injection will not work because progesterone has a birth control effect in pregnant women. In the case of menopausal women, who have been menopausal for a long time and have very low hormone levels, progesterone injections will not produce a period either.