If you have sex the day before the hysteroscopy, you cannot have the hysteroscopy. 1. Most of the hysteroscopies are done around 3-7 days after menstruation, which is basically the ovulation period. If you have intercourse, it may cause pregnancy. 2. If you have intercourse the day before the hysteroscopy, it may also cause pathogenic infection. During the hysteroscopy, if abnormal superfluous organisms are found in the uterine cavity, the superfluous organisms may be removed or diagnostic scraping may be done at the same time. Infection by pathogenic bacteria can cause inflammation of the endometrium. Therefore, if you have intercourse the day before the hysteroscopy, you should not do the examination and do it again at another time to avoid serious consequences.