Eat yutin there is no withdrawal bleeding does not indicate contraceptive success or failure, if eat yutin there is no withdrawal bleeding, in clinical most are taken in the second half of menstruation, the second half of menstruation ovaries have ovulated, the local formation of the corpus luteum, in the role of the corpus luteum endometrium will not appear to shed the phenomenon, so even if you stop yutin there will be no withdrawal bleeding, this situation in the clinical It does not indicate contraceptive failure, nor does it indicate contraceptive success. Yutin is clinically effective, but it does not achieve 100% contraceptive effect. If you have not had your period by the time it is due, it is recommended to take an early pregnancy test to rule out the possibility of pregnancy if it is more than 5 days after your period.