Abnormal Period? =/

[squegeebcknheim.livejournal.com]

So I should be on my period this week and I am, but it's very different from how it usually is. I normally have heavier periods, this one is very light, to the point that I can go without wearing a pad and there won't be any blood on my underwear. When I wipe after going to the bathroom, there's some brown stuff and one or two clots that are very dark red, or even black. Today I put in a tampon because I was going shopping and when I took it out 2-3 hours later, it was streaked with black-no red or even brown, just black. This has been going on for a week, normally my periods are 5 days at most. I've also had a constant headache since it began and some nausea. There's no chance of pregnancy. I just can't figure out what it could be. Help? =/