Period starts & lasts 3 days stops for 1day, then bleeding starts again but only inside the vagina (doesn'5 come out) for 2 days then ends. why?

Period: This sounds like you should make an appointment with a gynecologist to evaluate you.

Irregular periods: Irregular periods are one of the most common problems obgyns treat. If this is one time problem it usually resolves on its own. If this is a recurring problem you should be evaluated. There are many options available to help regulate the menstrual cycle. Schedule a visit.