At least 3 months before the preparation of pregnancy, both spouses should quit smoking and drinking, so as to improve the quality of sperms and eggs. Smoking and drinking will affect the quality of eggs and sperm, and poor sperm and egg quality will result in a low fertilization rate or a poor quality of the conception sac, which will easily result in miscarriage. Before preparing for pregnancy, both husband and wife can also visit the clinic for eugenics checkups, such as eugenics ten items, liver and kidney function, thyroid function, sperm quality and so on. During the preparation for pregnancy to relax the mind, the more anxious the more impact on the success rate of preparation for pregnancy, learn about the knowledge of pregnancy, in the ovulation period reasonable arrangements for intercourse, in order to increase the probability of conception. If you want to know more, it is recommended to consult a professional doctor.