It is generally not possible to detect that a woman has taken the pill. Oral contraceptives can be divided into short-acting contraceptives, long-acting contraceptives and emergency contraceptives according to their types. No matter which one a woman takes, it is generally impossible to detect it clinically because there is no particularly effective test method to detect the concentration of contraceptives in the blood. Contraceptive pills are hormonal preparations, mostly made of estrogen and progestin, but also single-party progestin and some non-steroidal drugs, which can be broadly divided into compound preparations, small-dose progestin, high-dose progestin and anti-progestin according to the mechanism of action. There is no way to check the secretion of estrogen and progestin in each woman’s body. If you want to prevent pregnancy, it is not recommended to take oral contraceptives because they change the level of estrogen and progesterone in the body, which will inhibit or interrupt the normal state of the neuroendocrine axis, and long-term use will have certain effects on the body.