If you have taken the pill to prevent pregnancy, but you have not had your period for more than 10 days by the time you get your period, you should first rule out the possibility of pregnancy. Although birth control pills are effective, they are not 100% effective, so some people may fail to get pregnant because of individual differences, so it is important to use the morning urine to take an early pregnancy test to find out if you are pregnant. If you are pregnant, go to the hospital for the appropriate tests according to your individual situation and then decide whether to terminate the pregnancy or continue it. If you are not pregnant, you can take oral progesterone to induce menstruation, and you will get your period 3-7 days after you stop taking it.