Taking medicines 1 month before pregnancy, generally has no effect, but some special drugs can not be eaten, such as antiviral drugs, antitumor drugs, quinolones, these drugs have an effect on the fetus after pregnancy, if you use these drugs, it is best to use the drug 3-6 months before pregnancy. These drugs are more toxic metabolism is also slower, most need 3-6 months to metabolize clean, so if there is a requirement for childbirth, it is best to metabolize this drug before pregnancy. Depending on the type of medication taken, it will be possible to determine whether or not you can become pregnant.