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I got my period, then a day or two in had (protected) sex with my boyfriend. It stopped a couple days later, and I thought it was strange how light and short it was. We had unprotected sex a few times a couple days later (he pulled out), then I experienced what I thought was implantation bleeding, with light pink/brown spotting (I'd had this bleeding the first time I got pregnant). I took three tests, all of which were negative, and the bleeding went from a light spotting to what I would describe as full period bleeding (i.e. bright red and enough to fill a couple tampons/pads per day). I experienced mild cramping the first couple days, and nothing after that. I took another test, still negative, though to be safe I plan on taking one every couple days for the next week or two. Any ideas what the bleeding could have been? Has this happened to anyone else?