Could I be pregnant

I havent missed any periods or anything but I think my hormones are off balanced lately I get pretty emotional and stressed out and im tired a lot and my lower stomach has gotten bigger in the last few months but I dont think im just getting fat, my stomach isnt fat and squishy (for lack of a better term, you'll have to excuse me its 3 something in the morning) it seems firm, not hard though, mind you, just kinda firm. So could I be pregnant or might it be something else?

I can't diagnose you over ther internet.
The only forsure way you could find out is by a home test or a blood test by your doctor.

1.) Have you had unprotected sex in the last few months?
2.)If you have, don't try guessing and worrying. Get a home pregnancy test from the local Wal-Mart or whatever.

Then go see your family doctor or Planned Parenthood clinic for advice EVEN IF YOU ARE NOT pregnant. Tell them you want confidentiality. They are legally bound to grant it. (It's a federal law called HIPAA).
Good Luck!!