Dydrogesterone one day after taking menstruation may be related to the failure of abortion preservation, menstruation, and other diseases. 1. Failure of birth control: Progesterone insufficiency leads to preeclampsia, if treated with dydrogesterone, vaginal bleeding similar to menstruation may occur when birth control is unsuccessful, and bed rest is needed, and timely treatment of birth control in the hospital. 2. Menstruation: During the oral administration of dildrogestrel to regulate menstruation, just at the time of menstruation, some women take the drug for a short period of time, may not be affected by the drug, the normal menstruation. 3. other diseases: dydrogesterone take a day to menstruation, there may be endometrial lesions or cervical lesions caused by, for example, endometrial inflammatory reaction occurs, will lead to the local tissue is relatively brittle, so there will be shedding of bleeding, abnormal vaginal bleeding, mistaken for menstrual flow. Adverse reactions such as breast sensitivity and pain may occur after use of the drug, and the drug is not recommended for breastfeeding women. The presence of particularly severe headaches and migraines should lead to immediate discontinuation of the drug. This drug is contraindicated in persons with hypersensitivity to this drug or the ingredients in the formulation, suspected sex hormone-related malignancies, and unexplained vaginal bleeding. The above medicines should be used in accordance with the doctor’s instructions, and in the event of menstruation after one day of taking Deferiprone, it is recommended to seek medical attention.