Help!!!

This is my fourth month taking birth control, So last month I had a bad pregnancy scare but I ended up having a normal period and took a pregnancy test and it was negative. I take my birth control perfectly and use condoms, This month I started having brown discharge/small clots 3 days before my period is due, and I just have bad anxiety to begin with so I took another pregnancy test yesterday which was also negative but I’m kinda worried about the discharge and I was wondering if this is normal at the beginning of a period? Normally I don’t have this so I’m worried! 😭