am I possibly pregnant?

I'm sure there are many posts asking this. But I have been TTC for a while now. My period is due Wednesday I'm not sure if I'm just having pms or is it possible too have early pregnancy signs. I have tender breasts (worse than usual) strange sleeping patterns, back ache, stomach cramps and severe headaches at least twice a day also achne. I had sex twice in my ovulation window. I taken a pregnancy test 3 days ago and got a negative result. I keep having pinch like sensations in my stomach. I haven't had any spotting or bleeding so far what so ever. Has anyone else had pretty much similar period pains and pms and still had a possitive test at the end of it?