Bladder pain??

Hi everyone! I have been on the birth control pill for over 12 years now, and recently went off of it because my spouse and I are going to try to get pregnant in the next 6 months or so. I’ve read that your period symptoms may be totally different than what I’m used to because of the change in hormones....I’m supposed to start my first “natural” period in a few days, and have been having strange “UTI”-like symptoms—bladder pressure, urgency, tenderness, etc but when I got tested for a UTI it was negative! I thought maybe this could be some weird pre-period symptoms that I never experienced before. Any other ideas of what this could be?