Pregnancy?

Hi. I had ALOT of sex in the past few weeks (we used condoms but i am not on birth control), and in the past few days i haven’t been able to eat or drink anything but water, because it makes me so nauseous. I’ve had some cramps and my back hurts, as well as being dizzy and fatigued. I don’t believe the condom broke any of the times that we had sex. I was also on my period two of the times that he had sex. I am ovulating right now and the last time we had sex was on Saturday. I know i’m probably irrationally worried, but is there a chance that I am pregnant?