Is the 'Isha' prayer to be repeated after seeing traces of urine upon returning home?

A woman is not required to wipe the inside of the vagina when performing istinja' (cleansing after relieving oneself); rather, she only washes what is visible, as it is considered part of the outer body. As long as urine or other impurities are inside the vagina, they are considered internal and do not invalidate wudu' (ablution). If there was a trace of urine inside the vagina, it has no effect on the Isha prayer because it did not exit until after the prayer. If it was on the outside of the vagina or on the clothes, your prayer is valid, and you are not required to repeat it if you only became aware of it after the prayer. Your wudu' is not invalidated unless you are certain that urine exited your body after wudu' and before the prayer concluded; in that case, you must repeat wudu' and the prayer. We advise you to disregard obsessive thoughts (waswas).