Im on birth control, me and my boyfriend had unprotected sex one day after my period ended which was a little over 2 weeks ago and a few times since then it. I am not supposed to start my period for another week and this mornin I started exactly a week early. My cousin had a period her first month she found out that she was pregnant. I have been nausious for 3 days now, I havent been able to eat hardly anything for three days. I thought that if I were pregnant that was a little soon to be nausious. I have also been a little light headed but I was not sure if it was because of lack of eating. Is it to early to see if im pregnant with a pregnancy test. Could I be pregnant?