I often encounter patients in the clinic asking, “Doctor, I took the wrong medication and I’m pregnant, can I still have this baby? In fact, as long as you are clear about the safety level of the medication and the timing of the medication, staying or not staying is not a matter of entanglement. First of all, it is important to distinguish the safety level of drugs used during pregnancy. The current standards for drug hazard levels are promulgated by the U.S. Drug and Food Administration (FDA). Most drugs have a hazard level developed by pharmaceutical companies according to these standards; a few drugs have a hazard level developed by certain experts (those with an “m” after the level letter). Some drugs have two different hazard levels because their hazards can be due to their duration of use. The classification criteria are as follows: Class A: In studies with control groups, no evidence of fetal harm was seen in women in the third trimester (and no evidence of harm in the following six months), and there may be little effect on the fetus. Grade B: No effects on the fetus were seen in animal reproduction studies (no controlled studies in pregnant women). Side effects were demonstrated in animal reproductive studies, and these side effects were not confirmed in women in the third trimester (and there was no evidence of harm to the subsequent 6 months). Class C: He has demonstrated fetal side effects (teratogenic or embryonic killing) in animal studies, but has not been studied in women in control groups or in women and animals in parallel. This class of drugs should only be used after authoritative evidence that the benefits to the woman outweigh the risks to the fetus. Class D: by clear evidence of harm to the fetus, despite the harm, but with absolute benefit to the pregnant woman with the drug (for example, the pregnant woman is threatened with death or has a serious disease and therefore needs to use it, such as the application of other drugs that are safe but ineffective). Class X: Studies in animals or humans have shown that he can cause fetal abnormalities. Or it is considered from experience that in humans, or in humans and animals, is by harmful. The application of this class of drugs in pregnant women is clearly not beneficial. This class of drugs is contraindicated in patients who are pregnant or will become pregnant. The specific class of drugs belongs to which can be read the instructions or Baidu, if it is a class A or B, then congratulations, there is no relationship, if it is a class C, then you can consider staying or not staying, to be analyzed on a case-by-case basis. For example, commonly used cephalosporins, azithromycin and other antibiotics are class B drugs, which are safe to take during pregnancy. Secondly, about the timing of medication: 1. Within 14 days of implantation: generally full or no effect. That is to say, either the drug effect leads to embryonic death, i.e., miscarriage or non-fertilization (that is, no pregnancy); or there will be no serious consequences. So ladies who have taken the emergency contraceptive pill 72 hours after sex, you can rest assured that you can continue the pregnancy. However, some people may take the pill later, or take the pill continuously, or have unprotected sex before taking the pill this time, then taking the pill may not be safe. According to research studies, before and after conception of women who have taken norethindrone birth control pills, the incidence of fetal malformation rate of about 8.4%, so still try not to take the drug Oh. 2, 14 days to 3 months after conception: teratogenic sensitive period, if not necessary, firmly do not use, otherwise affect the embryo development. If you must use drugs, be sure to use them carefully and safely under the guidance of a doctor. If you have a history of taking drugs, you can have prenatal diagnosis (including ultrasound) in 16~20 weeks of pregnancy to further understand the fetal growth and development and exclude fetal malformation. 3.After 3 months: This is the period when the fetus’ organs are basically differentiated and continue to grow. The possibility of drug teratology decreases greatly during this period, but some drugs may still affect the normal development of the fetus. 4, medication before delivery: pregnant women should pay extraordinary attention to medication in the last 1 week, because when the fetus becomes a newborn baby, the metabolic system in the body is not perfect, it can’t deal with and eliminate drugs quickly and effectively, and the drugs may accumulate in the baby’s body and produce the performance of drug overdose. Are all herbal medicines safe to take? Chinese herbs are not always safe for pregnant women. During the first 3 months of pregnancy, the following 4 types of herbal medicines should be used with caution: highly toxic and hot medicines, blood activating and siltation medicines, slippery and tapping medicines, and aromatic and running medicines, mainly including centipede, cinnabar, musk, Andrographis paniculata, coix seeds, cloves, and motherwort. Finally, if you accidentally use any medication during pregnancy, don’t panic, seek professional medical advice, and also look up relevant information to determine the possible effects. Never abort blindly, every baby is an angel and wants to come into the world yet!