Pregnant?

So I had a normal period about a month ago. It was a lot lighter than normal, and I hardly had any cramps, but I didn't think anything of it. But, it never ended! I've had that last day, dark blood for the past 4 weeks now, almost constantly! I was supposed to start my period again sunday, and I did, but it's been very light and I haven't had any cramps at all. (not that i'm complaining!!) and now tonight it seems like it's gone. (time to get a little gross here...) there was also this thick, clear mucus looking stuff on my tampon tonight, which never happens with my period. I took an hpt, and it came back negative. My question is, if that's true, what the hell could be wrong with me?! (i was supposed to start seeing a new doc tomorrow, but thanks to a screw-up on my official start date at my new job, my health insurance wont kick in for another 2 weeks... Talk about being up a creek without a paddle..) I haven't been feeling sick besides when I think about eating greasey food in the morning. Other than that i've only been a little tired. And not a whole lot more emotional than usual. But I think that all might be related to being concerned about what could be going on. Any thoughts anyone??


Thanks!!

-confused