<qa>  What is the hysterosalpingograph?- Bilateral fallopian tubes are unobstructed proved by hysterosalpingograph or laparoscopic examination within one year, no history of abortion or pelvic infection after the examination, the researcher decide whether the above examination need to repeat. If the subject had salpingoplasty under laparoscope, and the bilateral fallopian tubes are unobstructed after the surgery, there is no need to have the hysterosalpingograph. If it can not be confirmed, it must be done again to prove that the bilateral fallopian tubes are unobstructed. 