Is it normal to have brown discharge from time to time during the first trimester of pregnancy? Should I be concerned?

Hello, I had a miscarriage in the spring. I am currently 6 weeks pregnant. I had brown discharge on my supposed menstrual days (for 4 days) and the discharge stopped afterwards. Blood tests were done to make sure that the HCG level had doubled. The level had more than doubled. I find myself a week later, still having some brown discharge when I wipe myself. I don't have any sharp pain/cramps and my blood is not bright red either.