Me And My Boyfriend Had Unprotected Sex Quite A Few

me and my boyfriend had unprotected sex quite a few times over the course of a week, and he always pulled out just before hed ejaculated, the last time we did was about 4 days ago, and ever since then ive felt sick and dizzy and empty, I have no appetite and havnt been able to eat, I alos was sick first thing this morning and my belly is in absolute agony. is it possible that I could be pregnant?