Spotting for 2 weeks

Okay, here's my situation:

My mom won't let me go to the doctor because I don't have insurance and she says she's not shelling out a bunch of money for something that's probably no big deal.

BUT... Here's my 'deal':

For a year, I had been getting the birth control shot, which gave me no periods. In September of last year, I stopped taking it, and finally had a period in January of this year. After that - no more periods. I FINALLY had another period starting on May 26th, and it was a normal period.

My boyfriend and I rarely have intercourse any more since we had a baby who is now two years old, so the last time we had it was two weeks after that date, which was on June 9th. Ok, now I'm well aware that a woman is most fertile 2 weeks after her period, so it MIGHT be a posibility that I'm pregnant.

I haven't had a normal period since May 26th, but for the past two weeks, I've been spotting a little bit about twice a day. When I wipe, there's sometimes a little bit of pink with a tiny clot, and sometimes it's a pretty big gush of blood.

I've been constantly tired (like falling asleep if I'm sitting still for too long tired) for about a year now, so that's nothing new, and I've always had frequent urination ever since getting pregnant, so that's not really anything that has changed either. Before getting pregnant, and after losing the pregnancy weight, I used to be 280 and since losing the pregnancy weight, I've gained it all back, coming up to about 380 now. Could this rapid weight gain be the reason for all of this? Could it be type 2 diabetes?

I wouldn't worry about it, but I've never spotted like this before, for this long. I just want some opinions before I take any actions because I'm one of those people who can't really afford to have that many options about this kind of stuff. I can't even afford a $1.00 pregnancy test until wednesday! But until then, I would really like to know what everyone thinks. I would really appreciate it!