Is It Possible Im Pregnant?

I knw this questioin has been posted a million and one times, but i have no one to talk to about it.. i mean i have my parents but im really not ready to share this info with them... ok im 22 yr old college student and my period is digustingly regular & i know you guys arent doctors or whatever, but anyway i have been having unprotected sex with my boyfriend (not responsible i know) but anyway we use the withdrawal method, but about 2 weeks ago we went round after round, but he ALWAYS pulls out and ejaculates elsewhere.. But im 2 days late for my period.. i checked my calendar and this "slip up" occured a day after i ovulated so i wasnt fertile, but ive been really light headed and dizzy lately my body is sore i have the urge to throw up i dont have an appetite, which has me wondering could i possibly be pregnant i read elsewhere on the internet that pre-*** doesnt contain sperm, but if he has recently ejaculated that, that sperm could flow out with the pre-***.. is this true.. and there is no way i could be having pregnancy related symptoms this early on right? all answers are appreciated.. Thanks