1. Newlyweds: Because of the exhaustion before and after marriage, the bodies of both men and women are not in the best state, and the quality of sperm and eggs is not good, which is not conducive to the conception of the next generation. Therefore, it is not advisable to get pregnant right away during the honeymoon of the newlyweds. 2, alcohol: alcohol in the body to reach a certain concentration, can cause damage to the human reproductive cells, so that the development of fertilized eggs is not sound, may lead to fetal development delay, after birth mental retardation. 3, long-term medication: drugs may affect the development and maturation of female eggs. Therefore, it is not advisable to get pregnant immediately after taking medication for a long period of time. 4.Radiation: X-rays can damage germ cells and cause chromosomal aberrations or mutations. Therefore, women who have received X-ray fluoroscopy, especially abdominal fluoroscopy, are generally safer to get pregnant after 4 weeks. If a woman receives radiation therapy due to illness, she should stop treatment for six months before getting pregnant. 5, oral contraceptives: contraceptive pills are synthetic hormone drugs, the body needs a period of time to metabolize. Therefore, pregnancy can be considered more than half a year after stopping the drug. 6, after the removal of the ring: the principle of contraceptive ring is to produce stimulation of the endometrium, interfering with the fertilization of the egg to bed. After 2-3 menstrual periods (endometrial repair) after IUD removal, pregnancy can be considered. 7. Miscarriage, preterm labor and term delivery: Since it takes some time for the female reproductive system and other organs to recover, it is not suitable to get pregnant immediately after miscarriage, preterm labor and term delivery. 8, cesarean section: without considering the effect of surgery, cesarean section uterine incision scar healing in 1-2 years after surgery is the best. Therefore, it is not suitable to get pregnant within 1 year after cesarean section.