Implantation bleeding?? Something seriously wrong?? Spotting, cramps, tired....

Hi, I am 20 y/o, no kids. I made a HUGE mistake (and i know this so pls don't post about how irresponsible I was because I know.) Anyways, My last "period" was June 9th, 2008.. Last night I noticed some pink discharge but ignored it because it was so light and only present when I wiped. When I got home from work about 5 am I went to the bathroom and noticed it was brown, maybe the size of a nickel. It stopped for a little while. All day today nothing. Then I went to the bathroom and had the same pinkish color I had at work. About an hour ago, (I've been peeing alot) I went pee and there was definitly a little bit of blood mixed in with come clear discharge. (When I wipe...) I'm not due for my period for another 10 days. I've had some cramping for awhile now but not as harsh as my PMS cramps. The only other thing I've noticed it that I'm extremely tired ALL the time. I find my self taking naps in the middle of the day or after I eat and that's not like me at all... PLEASE someone post their opinions and/or experience's....