Endometrosis? Bleeding? Idk

Emma ♡
Hi. So im looking for advice.. About a year ago i stopped having sex cause it hurt like hell. Anyway ive just been doing simple foreplay with my guy and today he was fingering me and everything was fine but when i went pee im bleeding bright red.. I thought ok no big deal maybe he accidently scratched me.. It didnt burn or was painful. Im still bleeding a bit but it's like a light brownish that keeps coming out of my vagina. This is happening often now... Could it be blood thats trapped??