My gf thinks she had a bad haircut, but she is also saying her head hurts and she is angry.  We had sex with a condom on and had no breaks or slips.  But now I'm freaking out because headaches is a pregnancy symptom !!  We had sex on day 8 of her 26 day cycle but again, used a condom.  But I'm freaking out now!  Her period is due Monday or Tuesday .  Help, I feel like throwing up now.