Taking Yosmin makes the uterine lining thin mainly because Yosmin is a short-acting contraceptive pill, the contraceptive mechanism has a point that will make the uterine lining thin, the thinning of the uterine lining to prevent the fertilized egg from bedding, so as to achieve the purpose of contraception. So when you take Yosmin, it often leads to a gradual decrease in menstrual flow, mainly because the lining of the uterus has become thin. Clinically, some people who have been taking Yosmin for a long time will also experience amenorrhea, once amenorrhea occurs, it is recommended to stop taking Yosmin, after stopping taking Yosmin, menstruation will be restored in about 2-3 months, and if you want to continue to use Yosmin for contraception in the 3 months following the restoration of menstruation, you can take Yosmin to give contraception again. Although the clinical contraceptive effect of Yosmin is very good, but it does not achieve 100% contraceptive rate, so the occurrence of amenorrhea also need to rule out the possibility of pregnancy.