Miscarriage has the potential to cause secondary infertility. The more common cause is bilateral tubal obstruction. It is recommended to try to have intercourse during ovulation to increase the chances of conception. Fourteen days before the next menstrual period is the ovulation period, ovulation discharge is thin, there is a degree of pulling, some people will have a slightly swollen feeling under the float. After ovulation body temperature rises 0.3-0.5 ℃, combined with the symptoms of ovulation, according to the regularity of their menstrual cycle, try to cohabitate in the ovulation period, if the miscarriage of more than one year without contraception, no pregnancy, you can first do ovulation detection test. If there is normal ovulation, the next step is to do a tubal imaging to clarify whether there is tubal obstruction. Tubal imaging is performed 3-7 days after the menstrual period is clean, do not have intercourse, and then decide the next treatment plan according to the test results.