Is there a high chance that I'm pregnant?

It could just be your nerves, I say just wait until a missed period and if you're late then take an HPT. Until then just try and relax and not over-think it otherwise you could end up feeling certain symptoms and your mind could play tricks with you and that will just confuse or worry you even more. But honestly, if you're on the pill and you've never missed a pill, chances are, you aren't pregnant!!!