Period / Pregnancy? Help ?

My fiance and I had unprotected a couple weeks ago. Lo and behold, I'm hit with nausea, frequent head aches, dizzy spells, complimented on my glow (which I didn't know I had), and Crying through an entire movie that I would have laughed at normally.. I was ecstatic at the idea of being a mom.. But earlier today I started bleeding a little bit I thought "Oh. I'm just spotting, it will go away.." but now.amongst my trip to the bathroom.. I discover that the bleeding is WAY heavier. (If it were period->2 weeks early) I don't know whether I was pregnant and something is wrong.. Whether I'm spotting like mad, or I started my period two weeks early.. I need an opinion.. I haven't told my fiance yet.. Someone please help.. :((