Am i pregnant? symptoms:?

My best friend& I had unprotected sex on Wednesday. He pulled out. On Saturday evening I got really hot and fainted unexpectedly. Sunday I felt lightheaded. Yesterday and today a bit woozy. I checked my menstrual calendar and found that we had done it during my ovulation week. I know its possible that I could get pregnant from precum, but how probable is it? And does it sound like I am? Im heading to the doctor to get checked out.