Why does tubal ligation hurt the first time and not the second time?

Tubal fluids why the first time pain the second time does not hurt to consider with the fallopian tube has been opened.
Tubal fluids are used to inject the cervix from the cervix into the uterine cavity, through a certain pressure of the liquid, so that the obstructed fallopian tubes to restore the method of fluids. For women with blocked fallopian tubes, there will be obvious pain during the first pass because the fluid may open up the adherent parts, and the pain will be reduced or disappear during the second pass because the fallopian tubes are gradually opened up.
Women are forbidden to have sex for 2 weeks after the procedure to prevent gynecological inflammation such as pelvic inflammatory disease. Abdominal pain and vaginal bleeding may occur after the procedure, and the symptoms can be relieved on their own in about 1 week.
For women with blocked fallopian tubes, it is recommended that they go to the gynecology and reproduction departments of regular hospitals, and choose the appropriate way to make the fallopian tubes open under the doctor’s guidance, so as to increase the chances of conception.