This topic is not in my professional scope, so it is not easy to talk about it. However, there are so many friends and relatives around me, and there are so many misunderstandings, that I rarely see a more formal answer. I have also observed that many doctors explain their condition to their patients and open their mouths: 6 months of contraception after this miscarriage! If you ask why, you only get a rhetorical question: Isn’t that what everyone says? From the patient’s point of view, many people also feel the need for such a period of “conditioning”, a little more professional will claim to let the “endometrial repair repair”. There is no basis for these ideas. Most abortions in the early stages of pregnancy, whether spontaneous, medical or abortion, are very safe, and the incidence of complications and sequelae are very rare and cause very little damage to the body. The recovery of the endometrium is marked by the normal menstrual flow. When normal menstrual periods are restored, the lining has been repaired. Okay, so how long does it take to get pregnant again? The prestigious weekly medical journal British Medical Journal (BMJ) published a large cohort study in Scotland in 2010. In this study, more than 30,000 women who had miscarriages (their miscarriages occurred before 24 weeks of pregnancy) were divided into three groups: pregnancies within 6 months of miscarriage, pregnancies between 6 and 24 months after miscarriage, and pregnancies more than 24 months after miscarriage. It was found that the group of women who had a pregnancy within 6 months of miscarriage had the best birth outcomes (both mother and baby); those who had a second pregnancy more than 24 months after miscarriage had the worst birth outcomes. These outcomes include: recurrent miscarriage, intrauterine death, ectopic pregnancy, cesarean section, preterm birth, and low birth weight. Therefore, the argument for 6 months of post-abortion contraception does not hold water. A prospective study published in 2015 in the Journal of the American Congress of Obstetrics and Gynecology (Greyhound Journal) divided women who miscarried before 20 weeks of gestation into two groups: those who became pregnant within 3 months after miscarriage and those who became pregnant 3-6 months after miscarriage. The results found no significant differences in live birth rates and adverse pregnancy outcomes (including miscarriage rates) between the two groups. The average time from the end of miscarriage to pregnancy in the former group was less than 9 weeks! In other words, not to mention 6 months, you can get pregnant two or three months after miscarriage without affecting the health of your child at all! At the Reproduction Center of the Department of Obstetrics and Gynecology of Peking Union Medical College Hospital, Professor Deng Chengyan told me that for women with so-called “biochemical pregnancy” (urine or blood tests suggesting pregnancy, but ultrasound never sees a gestational sac), they recommend actively trying to have a baby that month. My wife also experienced an embryonic abortion where the baby lost its heartbeat at 9 weeks of gestation, which was a very sad event and directly changed our work schedule. When we got our period back, we didn’t delay and were still active in having a baby. As a result, our baby was born without any problems and looks very cute so far. In conclusion, 6 months of rest is not necessary after an early pregnancy miscarriage, and maybe not even 3 months. Many doctors and patients ask, why is that? I don’t know, and neither do researchers. Many explanations have been proposed, such as the immune theory, such as the trophoblast theory, etc., all of which have yet to be proven. In other words, we don’t know the “cause”, but we already know the “effect”. The mysterious “cause” should be left to clinicians and basic pathophysiologists. On the other hand, we already know that the prevalence of fetal and neonatal morbidity is significantly increased if the next pregnancy is less than 18 months apart in cases of induced labor or full-term delivery at 20 weeks of gestation or more (above, not below). It has also been found that the neonatal morbidity rate is lowest in pregnancies with an interval of 12-24 months between pregnancies (pregnancies with more than 20 weeks of gestation). Short intervals (less than 6 months) or long intervals (more than 60 months) are detrimental, with intervals of less than 6 months being the worst and the mother experiencing many health problems. Why does this happen? Some people think it is related to folic acid metabolism, but the exact mechanism is still unclear to us. The universe is vast, the truth is deep, what we know is superficial, what we do is just imitation. But if we think out of the box and find another way, no one can stop us. Maybe we can really find something else and see the world differently.