There are very many patients who ask this question, so I will give you a short explanation: Within a week of the formation of the fertilized egg, it is not implanted in the uterine cavity, so basically there is no effect. In the week to two weeks after fertilization, this time the embryo is still a mass of cells, not differentiated organs, this time with drugs or other damage, if there is an impact, it will lead to the death of all the cells, and finally miscarriage, if the damage to some of the cells, it can be completely compensated for by other cells, so there will be a doctor to talk about “all” or “nothing”, meaning that as long as not to implant in the uterine cavity, so basically have no effect. Therefore, the doctor will say “all” or “none”, which means that as long as you don’t miscarry, it basically has little effect, and will not increase the chance of fetal abnormality. Of course, if you want the doctor to guarantee that there is absolutely no problem, the doctor will not dare to say, after all, not every pregnant woman who does not take the drug fetal normal, natural pregnancy itself has a 4% chance of malformation. 2 weeks after fertilization – 10 weeks when the important period of fetal organ formation, the use of drugs may lead to deformities, each period of time on each organ of the impact of different drugs can also lead to the development of fetal orientation abnormalities, such as quinolone is mainly aimed at the bone and cartilage, tetracycline is mainly affect the tooth enamel, but it is not absolute, but the risk will be relatively high, after all, our experiments are in the animal, human and other animals or there is a gap! , and there is a part of the deformity is not affecting the function, and is not lethal, such as tetracycline teeth, etc., unusually precious fetus can be considered to be retained. Other drugs can be specifically consulted with the doctor to decide whether to continue the pregnancy based on the duration of the drug, the target organ of the drug and the preciousness of the fetus. As for chest X-ray and radiation, what can be told is that as long as it is a diagnostic chest X-ray, it almost also has no effect, as long as it is not a CT of the abdomen, basically it does not have much effect on the fetus, and there is no need to be afraid of cell phones and computers, and there is no scientific basis for many pregnant women to blame cell phones, computers, and electromagnetic furnaces for fetal deformities. Anti-radiation clothing is not necessary, and there is no role, of course, not like the Internet rumors on the contrary harmful. As for animals, cats can not be raised, the dog is no problem, that is to say, the dog has always been wronged. Students who like to keep dogs as long as the dog is vaccinated, basically no problem. Poultry must not be raised. Alcohol and coffee are not recommended to be ingested during pregnancy, there is controversy in the medical community about alcohol and coffee, but they should be avoided during pregnancy. The above is basically expressed in language that everyone can understand, no jargon, so I hope you can read it and understand it, peers and professionals can bypass it. If you come across any of the above questions, you can read them on your own first, and ask me for advice if you still don’t understand.