Confused

AF is due tomorrow 12/2 but for the last month I've been nauseous, headaches every day, and getting light headed. Ive felt bloated all month since my last period and I have heartburn really bad after everything I try to eat. Im a heavy set woman and I can normally eat but lately ill be hungry and then when I go to eat I take a bite or two and feel sick and full. Is this signs of early pregnancy or just AF playing evil tricks? Ive also been feeling cramps in my lower pelvis/abdomen area for the last couple days they feel like period cramps but idk what's going on. Can anyone help with some answers please