Phantom Symptoms--Is it in my head?

Ok gals, been off of birth control for 3 weeks since my last period. Having diarrhea almost every day (sorry if TMI), some nausea, and general stomach upset. Also, today (AF due 8 days) have been peeing nonstop! Is it in my head? Too early for pregnancy symptoms right? 🤞🏻👶🏻