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This might be nothing, but I've been thinking about it the past few days so am asking. I'm 27 and have always been fairly regular with my periods. In October I got my period on Oct 11, and had unprotected s_x on Oct 23. My boyfriend withdrew and I wasn't too worried about the possibility of being pregnant. I thought my next period had started on the night of Nov 10 when I noticed a bit of bleeding, but when I woke up the following morning there was almost nothing overnight. That day and the following day I got a bit of bleeding in patches (I only needed a liner), and thinking it may have been implantation bleeding I took 2 pregnancy tests, the first one was invalid and the second negative. I got more bleeding the next two days that was a bit heavier, not as much as a normal period but enough to use tampons. I assumed it was just a weird period at the time, and last month (Dec) my period came about 5 days early but other than that was normal. I told a friend recently that I'd had unprotected s_x and got an unusual period after it (I've never experienced that before). I knew I definitely wasn't pregnant because I'd had a normal period since, but she mentioned chemical pregnancy. I don't know much about it, so wanted to know if there is any chance that is what it was, or just an unusual period. Any advice would be appreciated, thanks.