Recently, many patients have asked me, “I’ve been taking oral emergency contraceptive pills, but the contraception failed, do I have to have it done?” “I’ve been taking oral short-acting contraceptives, but the contraception failed, can the baby either?” … There are many questions like these. So, if oral contraceptives fail, can I have a child or not? Below, I’ll give you some information about this. Regular short-acting oral contraceptives and emergency contraceptives are two types of contraceptives that are very different in terms of applicability, mechanism and contraceptive effect. Applicable population: conventional short-acting oral contraceptive pills are suitable for healthy women of childbearing age to use daily contraception, is a long-term use of contraception, in the case of the correct use of one tablet per day, each physiological cycle for 21 days, can maintain a reliable contraceptive effect; emergency contraceptive pills are a remedial contraceptive, suitable for women who have suffered from unintentional injuries, engaged in unprotected sexual intercourse, or other contraceptive methods (such as accidental rupture of condoms). Emergency contraceptive pill is a remedial contraceptive pill which is suitable for women who suffer from accidental injury, have unprotected sex or other contraceptive methods fail (e.g. accidental rupture of condom), etc. It can be taken within 72 hours after the event to avoid unintended pregnancy but is not suitable for daily use. For example, Yuk-Ting (levonorgestrel tablets). Mechanism of action: conventional short-acting oral contraceptives by progesterone, estrogen joint action. As a safe and reliable means of contraception, conventional short-acting oral contraceptives have been continuously improved, the estrogen content is gradually reduced, and progesterone is also constantly updated. The progestin content of the new oral contraceptives has been very close to human progesterone, which can give women more additional benefits in addition to contraception, such as relieving water retention and preventing diseases such as ovarian cancer and endometrial cancer. The most common emergency contraceptive pills on the market, whose main ingredient is usually a large amount of progesterone, the amount of hormones ingested in a single use is comparable to that found in 8 days of regular short-acting oral contraceptives. Large doses of hormones can easily cause endocrine disruption and menstrual cycle changes in women. Therefore, it is recommended that emergency contraceptive pills should not be used more than three times a year and at most once a month. Contraceptive Effectiveness: Emergency contraceptive pills are mainly aimed at remedial needs after the event, with a contraceptive effectiveness rate of about 85%, which can reduce the likelihood of unwanted pregnancy. The conventional short-acting oral contraceptives, as long as the correct take, the contraceptive effect is very reliable, contraceptive efficiency can reach more than 99%. So, does pregnancy after oral contraceptives have any effect on the fetus or not? At present, the effect of contraceptives on the fetus can not be completely sure. However, it is generally believed that: short-acting oral contraceptives can be pregnant after stopping the drug, there is no need to wait 3 to 6 months; if the pregnancy, occasionally take a small amount of short-acting oral contraceptives by mistake, the mother and the fetus will not have a known harm, do not have to perform an abortion. The basis is as follows: I. The understanding of authoritative publications on obstetrics and gynecology at home and abroad tends to be that oral contraceptives have no effect on the fetus. 1. Williams Obstetrics (24th edition): “There is no evidence to support the association of oral contraceptives or spermicidal contraceptive creams and jellies with an increased incidence of abortion complications.” 2. World Health Organization Medical Criteria for Contraceptive Method Choice (3rd ed. 2004): “Incidental use of combined oral contraceptives during pregnancy has no known harmful effects on the course of a woman’s pregnancy or on the fetus.” 3. Chinese Obstetrics and Gynecology (2nd ed. 2004): “In recent years, with the improvement of epidemiological research methods and the accumulation of information, as well as the deepening of the understanding of the mechanism of drug teratology, there is a relatively consistent understanding of the relationship between oral contraceptives and congenital malformations, and it is believed that there is no obvious teratogenic effect of oral contraceptives in clinically applied doses.” Second, current pregnancy testing methods are more reliable. For those who become pregnant after taking oral contraceptives, pregnancy testing and monitoring should be strengthened to prevent fetal malformations. 1, take chorionic villus tissue for chromosome examination at 6 to 8 weeks of pregnancy, Down’s syndrome screening at 16 to 20 weeks of pregnancy, and amniocentesis or non-invasive DNA testing for early chromosome examination if necessary. 2.Between 18 and 24 weeks of pregnancy, the best 22 weeks of pregnancy for the first screening ultrasound; between 28 and 32 weeks of pregnancy, the best 30 weeks for the second screening ultrasound, a comprehensive understanding of the fetal morphology and visceral structure of the abnormalities. If there is no abnormality, the pregnancy can continue. Otherwise, the pregnancy should be terminated promptly.