TMI WARNING

So I’ve been having trouble starting my period ever since I had sex about a month ago now . I took a pregnancy test and negative . I have random hours of bleeding but then it just stop and I have what looks like old blood but this came out of me . I thought for a minute I had chlamydia and I know that could be something but does anyone know anything about this ? I don’t hurt and I don’t have any pain at all doing anything but just recently this has been happening . I want to go to a women’s clinic and get tested for things and I’m planning to . But I don’t have insurance or money at all .