Spotting after period

Beverly
So on June 2 I started my period it lasted the normal 5 days but ever since the last day every time I wipe the paper is pink. Some days I get pms symptoms but nothing major. Today I notice I had some stains on my panty liner and it was more dark. I saw my gyn Doctor on Tuesday and got my results today and everything came back negative stds, hpv, hiv, bacteria everything she tested for. She hasn't given me an explanation as to why I'm spotting. I haven't took a pregnancy test because I don't feel like that can be it. I'm going to make another appointment but I wanted to know if anyone else experienced this before. It's been 10 days already.