Pregnant? Help

Usually a few days before my period is supposed to start my breasts will be really sore & I'll have some cramping. My period is a day late & I still have no cramps & my breasts don't hurt. I've been really tired & nauseous. I went to lunch yesterday & ate 2 chicken strips & some fries & felt really sick & hot. Me & my boyfriend don't use condoms but he does pull out, I know you can still end up pregnant with that method. What should I do?