I really don't remember my pregnancy, especially the beginning (I try to block the trauma out). So…

I really don't remember my pregnancy, especially the beginning (I try to block the trauma out). So what are the first symptoms & when do you normally get them? I still have 4 more days until my period is due but I've had such terrible headaches & nausea the past couple days. I'd be fine but they aren't my normal period symptoms. I can't even eat anything with out feeling like I'm going to throw up. Any help?