Tubal fluids are injected into the uterine cavity through the cervix using phenol red solution, methylene blue solution or saline to clarify whether the fallopian tubes are open or not. It is normal to bleed a little after having a tubal flotation. After the tubal flotation, it will lead to different degrees of endometrial stimulation, causing different degrees of damage to the endometrium. This will cause a small amount of bleeding, which is normal. There is no need to worry too much. In addition, the water contains hydrogen peroxide, which can cause endometrial congestion, edema, resulting in a small amount of vaginal bleeding symptoms. Usually the endometrium needs a process to recover after the tubal irrigation, and the bleeding usually lasts for 2~3 days and can be stopped. Pay attention to maintain pubic hygiene and change underwear frequently. At least 2 weeks before having sex, so as not to cause inflammation and infection.