I had unprotected sex on August 31st after my apparent ovulation the week before. It did not last very long only about 2 minutes and he did not ejaculate inside of me. My period is late but I have been really stressed recently with school starting back. My stomach is also cramping like I’m supposed to get my period and my head hurts. My period is pretty irregular to begin with. Do you think that’s there is a possibility that I’m pregnant?