Is it necessary to repeat the ghusl if one remembers not having thoroughly washed the navel after performing ghusl following menstruation?

The water must be circulated over the entire body during a ritual bath (ghusl (definition)) for major impurity (janabah (definition)), reaching the folds of the body, the navel, the inner parts of the ears, the armpits, between the buttocks, and between the toes. If any part remains untouched by water, the ghusl is invalid, and the prayers performed with this invalid ghusl must be repeated. However, if it is highly probable that the water reached all these areas without rubbing them, then your ghusl is valid.