Stress, pill, or pregnant?

I have been on the pill since June and i just started getting intimate with my boyfriend this August. We had unprotected sex bc we got caught up in the moment. Anyways he came but not in me and my breasts have been sore and i have been getting cramps and have been PMSing a lot lately. According to the app and calendar, i am 2 days late. I have been stressing about school and work, ive also been getting headaches and ive been trying to stay hydrated in this heat so idk if that has anything to do with it as well. My doc had told me that since i am new, my cycle will take time to properly adjust. Should i tell him im late or wait it out until my new pack which will be this upcoming sunday or just take a pregnancy test which im trying to avoid or just calm down and see if my period arrives sooner or later?