Short-acting contraceptive pills early menstruation is mainly caused by the side effects of the drug, whether taking short-acting contraceptive pills or emergency contraceptive pills, because both drugs will make the ovaries are inhibited ovulation, and make the endometrial thickness changes, so it may lead to endocrine effects, will make the menstrual cycle changes, which led to early menstruation, this situation should not be nervous, you can continue to take oral contraceptive pills to give contraception, but also to prevent menstruation. Don’t be nervous in this case, you can continue to take oral contraceptive pills to give contraception. When you have adapted to the contraceptive pill, your menstrual cycle will be regular and you will not experience early menstruation. In addition, if you take the pill, it is best to do the appropriate examination before, to exclude uterine fibroids, exclude breast hyperplasia, and if you have high blood pressure, thrombosis tendency, diabetes, can not take short-acting contraceptive pills to give contraception, do not drink alcohol during the period of time you take the pill. And be aware that if you don’t have a period when it’s time to get your period, you may be pregnant, and it is recommended that you do a urine HCG test.