PLEASE HELP!!!!!!

I was supposed to have started on the August 28th or 29th, but I haven't. Since the 29th I have had CM like egg whites with a tiny, tiny amount of blood. The blood doesn't come out even when I wipe. My husband and I BD'ed on the 22nd and 23rd. Has anybody else experienced this or know what this could mean?? Could I be pregnant or just fixing to start AF?? I took a test last week and it was negative.