Endometrium 11mm in the case of pregnancy detection, usually oral progesterone 7 days, stop the drug 3 ~ 7 days will come to menstruation. Progesterone capsules as a natural progesterone, when women have delayed menstruation or long menstrual cycles, gynecologists often recommend patients to use progesterone capsules, usually need to take oral 7 days, stop the drug within 3 ~ 7 days after the menstruation will come. This is because the sudden drop of progesterone in the body after oral administration of progesterone causes the endometrium to peel off, resulting in menstruation. Progesterone belongs to the progesterone, can not be taken for a long time in large quantities, some patients oral may appear dizziness, weight gain, swelling and other adverse reactions, such as menstrual prolongation, should be timely gynecological outpatient clinic consultation, under the guidance of gynecologists to take, to avoid the adverse effects.