Taking dydrogesterone tablets and having menstruation may be a normal situation, but it may also be caused by incorrect medication, failure of birth control and other factors. 1. Normal situation: some women’s physical conditions are more special, after eating dydrogesterone tablets are not affected by the drug, at this time also have normal menstruation. However, the use of the drug should be stopped in time during this period of time so that menstruation can come normally. 2. incorrect medication: dydrogesterone tablets are mainly used to increase the progesterone drug, if not in accordance with the provisions of the medication, during the period of stopping the drug, omission, etc., will lead to hormone levels in the body is unstable, the hormone suddenly produce a decline in bleeding will occur after the withdrawal of the drug. If the amount of bleeding is not big, you can observe it first, but if the amount of bleeding is big, you should go to the hospital in time, and under the guidance of the doctor, you can get active treatment. 3. Failure of birth control: Diflucan tablets are also a kind of natural progesterone, so they can be used for birth control treatment. If a woman taking dydrogesterone tablets during fertility preservation has vaginal bleeding similar to menstruation, but not due to menstruation, but due to bleeding triggered by the occurrence of preeclampsia, then you should ascertain the condition of the fetus as soon as possible, and then determine whether you can continue to preservation of the fetus. If you are having a period while taking dydrogesterone tablets, you should take into account the actual situation of the individual to make a judgment, and consult a doctor for examination and treatment in a timely manner.