Infertility is only caused if there is a normal sexual life and no pregnancy for 1 year without contraception. In this case, it proves that the patient has factors that affect pregnancy, such as abnormal ovarian function, abnormal thyroid function, immune system diseases, endometrial adhesions, endometrial polyps or incompetent fallopian tubes, etc. In this case, systematic examination and treatment are needed. If the patient has just had intercourse for 4 months without pregnancy, it does not prove that there is necessarily a problem. If the patient has normal menstruation and no special discomfort, it may be due to the patient’s emotional stress during the preparation for pregnancy or failure to grasp the timing of ovulation, which may lead to failure to conceive in time. It is recommended that the patient monitor ovulation and guide intercourse to increase the chance of conception. Using ultrasound to monitor ovulation can clearly observe the development of follicles. If the follicle is 1.8cm, the patient can choose to have intercourse, once every other day, 2-3 times in a row, so as not to miss the ovulation time and greatly improve the chances of conception.