Good day! The question is not about a child?

Good day! The question is not about a child ? When does lochia end? More precisely, it can last up to 50 days. On the 42nd day everything seemed fine without discharge. The next day after intercourse started bleeding slightly. On the second day it felt like during menstruation and the blood was like in the last days of menstruation. Has anyone experienced this? Our gynecologist couldn't explain anything properly. You need to find a good gynecologist.