And since it is ONLY two days before my period that I had sex, would my period skip if I am pregnant?

Yes. If you are pregnant, you don't have periods. It's possible to have some spotting, or a very light breakthrough bleed which looks like a very light period, but if you have your normal period on time, you are not pregnant. If you have no period at all, you MIGHT be pregnant, but there are other things which can cause this.