In the early stages of pregnancy, it is generally not recommended for women to masturbate to orgasm. This is because masturbation, often due to the stimulation of sexual excitement, may lead to contractions of the uterus and vaginal cramps, which can often cause miscarriage due to the instability of the embryo at this time, so masturbation to orgasm is prohibited in the first trimester of pregnancy. The placenta is usually formed around the third trimester, and before the placenta is formed, various factors can easily cause a miscarriage. The miscarriage before the 8th week of pregnancy is mostly a complete miscarriage, because the placenta has not been formed, so the embryo is not firmly enough in the bed, is the most likely period of miscarriage, therefore, the miscarriage at this time is often shown as a complete miscarriage, complete miscarriage is generally less bleeding, bleeding stop after the expulsion of the embryo. Miscarriage is also easy to occur in 8-12 weeks of pregnancy, but this period is the early stage of placenta formation, and its miscarriage is often manifested as incomplete miscarriage, incomplete miscarriage bleeds a lot and may be accompanied by hemorrhagic shock, and it is necessary to clear the uterus in time when there is a lot of bleeding. The process of miscarriage is divided into pre-eclampsia, miscarriage. If masturbation is performed before 12 weeks of pregnancy, it will lead to the appearance of orgasm, that may cause obvious contractions and vaginal cramps, so then there will be vaginal bleeding, abdominal pain and other manifestations of pre-eclampsia, which requires fertility preservation treatment. Therefore, masturbation is forbidden in the early stages of pregnancy. It is usually recommended that it can be done occasionally after the fourth month of pregnancy, when the placenta has grown and the embryo is more stable, and it is important to pay attention to hand hygiene at this time to avoid vaginitis or infection in the uterine cavity. This is why women are forbidden to have intercourse in the first trimester of pregnancy, in fact, the same principle as the prohibition of masturbation is to avoid pre-eclampsia or spontaneous abortion, once this behavior, then you should try to rest in bed to prevent miscarriage.