Can i be??

Natasha • TTC #3 i have a 6 year old and 3 year old daughters
So when af showed few weeks ago I mainly spotted except for one tampon Which is not normal for me, and it was mainly brown, well ever since then I've been nauseous and dizzy, with my 2nd child I had my period the first month Which wasn't normal but was orange looking, I still have a week before af shows, hoping she doesn't, and I gave up taking a pregnancy test before af cause I'm tired of getting my hopes up, when I get a possibly a faint positive. Well anyways my question is could I b pregnant?? Can't go to doctor cause I have no insurance at the time, n the process of getting one. Has this happened to anyone before?? Anything??