I have been having brown discharge for 2 weeks now

Patient: I have been having brown discharge for 2 weeks now. My doctor changed my normal pill and put me on rigevidon and then cerazette due to having a slightly high blood pressure. I haven’t had a normal period since the end of December before my pill changed. I took a pregnancy test on 12th March which was negative. Please can you help as I’m starting to get worried and this is now effecting my sex life with my boyfriend.

Doctor: