Is it in my head?

So last month I had the worst period of my life. Heavy, terrible cramps, ect. I'm 28 and my boyfriend and I have been TTC for a little over six months. Well, I am not supposed to start my period for 9 more days, but I have been exhausted, never felt this tired before in my life. Now I'm feeling nauseous, dizzy, and extremely emotional. I hope this could be signs I am pregnant, I know its still to early to really tell. But I'm also afraid that I'm just wanting it so badly that it is all in my head. Any advice out there or similar stories?