Pregnant? Help!

So idk who else to ask, so here goes nothing. I was supposed to start my period last Wednesday, it was 4 days late and was just brown and light pink blood for about one day. Since, i have just been spotting light brown when i use the bathroom. My boobs are killing me and i feel like shit. Obviously it sounds like i’m pregnant (not ttc), but i have taken two tests that are both neg. help!!!