If you have been married for several years with a normal sex life and still not pregnant without contraception, you need to do a systematic examination. First of all, the husband should check the semen routine for 3-7 days when the two of them have not had intercourse without ejaculation to rule out the possibility of male infertility. For women, the examination is more complicated and requires ultrasound examination to see if the uterine adnexa are developing normally and ovulation monitoring from the 12th day of menstruation to see if the infertility is caused by ovulation dysfunction, sex hormone examination, thyroid function test and immunological infertility test. Based on the above results, a comprehensive analysis of the causes of infertility will be performed. If all of the above tests are normal, a tubal imaging test is recommended to rule out tubal obstruction as the cause of infertility.