Need advice..

So, First of all there’s hardly why way i could be pregnant, i am hardly sexual active and on birth control and we do it safely. i got my period a little bit early which isn’t uncommon with my birthcontrol, it lasted a few days longer than usual. it slowed down but never completely went to just my normal white discharge when not on my period, it was always brown like old blood looking. and that was for about a week, and then today, i noticed blood again, so i put a tampon in and went about my day and there was still hardly any blood, but still that same brown discharge looking stuff. my lower right stomach is tough and hurts to the touch but it’s more towards my side and right above my

pelvic bone. what should i do? should i be worried?