It is not recommended to blindly inject progesterone when your period is delayed for 10 days, you need to identify the specific cause and choose a treatment plan. Delayed menstruation may be caused by early pregnancy, stress, medications, polycystic ovary syndrome, hyperlactatemia, ovarian failure, and so on. The endometrium is affected by a certain level of estrogen, and with a certain level of endometrial thickness and no uterine abnormalities, most intramuscular injections of progesterone can bring on menstruation. Delayed menstruation due to cervical adhesions, uterine adhesions, polycystic ovary syndrome, ovarian failure, hyperprolactinemia, and other causes of intramuscular progesterone injections may not result in hormonal withdrawal bleeding when the medication is stopped. Intramuscular injection of progesterone may cause liver function abnormalities, weight gain, injection site hardness and other adverse reactions, and should not be abused privately. After delayed menstruation, you need to consult a regular hospital to find out the cause under the guidance of a professional doctor and then follow the doctor’s instructions to deal with the treatment.