HELP ME...AM I PREGNANT?

So my period started on Feb 25 & I can't remember when I had . My period didn't come on March 25, and its now April 8. When should I take a test? because it said negative twice. Ive been sweating, and hot but my boyfriend doesn't think I am, he tells me I feel fine. My oh. my. gosh. do they hurt. They are heavy, sore, feel like melons like every time I move, and walk they hurt. I went to bed at 5am and I just now woke up at 8:30 what's that about? I don't really feel hungry. Once in a while I get dizzy. Sometimes I get cramps on & off.... So Am I pregnant? If so, when should I start taking a test? what should I do? And how long am I? By the way thanking for helping me out...