After sleeping together, she took birth control pills. No withdrawal bleeding.

Each person's constitution is different, after the same room to eat contraceptives may not withdraw bleeding, but still contraceptive success. But do not rule out the possibility of contraceptive failure, if the menstrual period after taking the drug is normal, indicating contraceptive success. If after taking the drug, menstruation does not come late, it is recommended to check blood HCG in time.