I am a 22 yr old female. For 6-7 days, I have had the following symptoms: vaginal spotting of a brownish discharge (so little that I don't usually see it until I use the bathroom), feeling that I'm starving all the time and food cravings, feverish, a few dizzy spells, extreme mood swings and fatigue. I took a HPT and got a negative result, but my period isn't due until around Sept. 10th (it's now Sept. 2nd) and is usually pretty regular. Also, about 2 weeks ago I woke up with nausea and actually did throw up a few times. As much as I hate to admit, my boyfriend and I have had unprotected sex. However, I also have just started school again and have had some family issues which have caused some stress. I just recently stopped running a mile every morning as well due to an injury. I have heard of implantation bleeding but have seen that it's usually only 2-3 days but this has lasted a week now. Could it still be implantation bleeding/could I be pregnant?