Faint bfp.

I got a faint positive 4 days before my period is due. The positive was on a frer. I tested again with a dollar tree and it was negative. Im having my husband pick up another thing of frer. I started spotting at 7dpo (lasted a couple hrs), 10dpo,11dpo, and peach colored spotting this morning. Ive been nauseous, bloated, cramping (like a warm cramping sensation if that makes sense), and backs been hurting a lot. My question is should I believe this is a pregnancy or does it sounded like a chemical pregnancy? I miscarried early in july so my excitement quickly turned to worry and I feel a little bummed that it might not stick. Please any advice