Pregnant? Or just off?

First off, I am EXTREMELY regular. I don’t currently track ovulation, but I am on progesterone which I know can delay ovulation up to 4 days. I bled very lightly for 3 days a week before my period was supposed to start, and I still haven’t started my actual period. I tested on Monday and Wednesday, both negative, but I may test one more time tomorrow just in case. Has this happened to anyone else? Could I be pregnant or is this an indication of something else? I have an obgyn appt in a week and a half, but my mind is racing now.

P.s. I only started tracking love when we decided to stop birth control. My life isn’t actually that boring 🫣😂