If you are taking long-acting contraceptives, it is best to stop taking them for more than six months before considering pregnancy. Long-acting contraceptives can inhibit ovulation and change the thickness of the uterine lining, and the effects of the drug in the body will be gradually eliminated after stopping the pill, so it is recommended to prepare for pregnancy only after the resumption of six menstrual periods, and each period is normal. Before preparing for pregnancy, you must also do the appropriate health checkups to understand the health condition of your body, such as ultrasound to find out if there are any abnormalities in the uterus and adnexa. Blood tests for sex hormone six, thyroid function, to know whether the endocrine is normal, but also blood tests for eugenics five, mainly to know whether the body is infected with viruses that can cause fetal malformation, so as to achieve the purpose of eugenics. In addition, oral folic acid tablets should be taken before preparing for pregnancy to prevent fetal neural tube malformation.