Should I be worried? (TMI no pictures)

Last night I thought I was having back contractions while I was sleeping. I'm 7 months and 5 days pregnant, I have also gone to the bathroom twice today #2! In the past couple of hours. I have been so backed up, I heard these could be early signs of labor but I never want to call my doctor because I always feel like I'm over reacting. I'm just wondering if anyone has experienced this... I know nobody on here can give actual medical advice, but just wanted to hear everyone's opinions. TIA