hello, sorry this is going to be graphic but im really scared.. for the past few days ive had this brownish discharge, and my last period was really strange, didnt last as long as usual. i was worried i might be pregnant even though me and my boyfriend always use a condom, so i took a test but it was negative. then last night when my boyfriend and i had sex i started bleeding, now the discharge is still there but its more like bright red.

does anyone have any idea what could be going on? im quite scared any help would be really appreciated, thankyou.