So whenever me and my boyfriend have sex , I go to the bathroom right after just soo I can wipe of my wetness, and I always notice I have a tiny bit of spotting it’s not red it’s very light too and very very little bit . And it has happened a couple times . Already we have been together for about three years almost and I know he’s not cheating on me . I looked it up on google and it just tells me it’s a STI but i don’t know how that could happen?? I just need some advice on to what it has to be .