Missed Period

I had my last period October 26th-November 1st. My next period was due 3 days ago (November 28th). It’s not super uncommon for my period to be irregular but I have gained 8 pounds, my stomach is bigger, my chest is bigger, I’ve had to pee a lot more, I’ve gotten cramps, and I’ve had nausea and cravings. I did have unprotected sex before my last period but not since. I never took a test or was worried since I did get the last period. With the late period now and the symptoms, I’m wondering if maybe it wasn’t an actual period the last time and was actually implantation bleeding or whatever other normal bleeding that sometimes happens with pregnancy? I’m probably just overreacting for nothing but just wanted som other perspectives.