Hello, I don't know what kind of medicine you are drinking to tonify qi and blood, but from the point of view of traditional Chinese medicine, blood overflow will belong to meridians, and blood overflow will suck blood. Drinking drugs that tonify qi and blood will not lead to bleeding in the middle of menstruation. Even if you are a person with weak qi and blood at ordinary times, there will be no bleeding in the middle of menstruation (I don't know how much). Of course, some people eat a lot of drugs that tonify qi and blood and cause bleeding, but all of them are mouth and nose bleeding. Your bleeding is in the middle of menstruation, and it has happened before. I suggest you go to the hospital for a check-up, find out the cause of bleeding and then deal with it accordingly.