Whether taking medication in 3 weeks of pregnancy has any effect on the fetus is something that needs to be looked at depending on what kind of medication is being eaten, the development of the fetus at this stage is relatively sensitive, and if medications that are prohibited or prudent during pregnancy are taken orally, there may be some effect.
Generally speaking, during 1-2 weeks of fertilized egg formation, the embryonic tissues are not yet fully differentiated, and medication at this time may not have a great impact or may cause miscarriage. But after 3 weeks of fertilized egg formation, is the fetus into the sensitive stage, this time is an important period of organ development, the use of drugs is likely to affect the development of the fetus.
At the same time in pregnancy there are some drugs can not be used, such as antibacterial drugs, antiviral drugs, isotretinoin drugs, statin lipid-lowering drugs and so on, is likely to lead to fetal deformity or miscarriage.
Therefore, drugs used by pregnant women, regardless of whether they are pregnant or not, should be used according to the doctor’s prescription, and should not be used without authorization.