Bad lower back pain at night

Just wondering if anyone else is experiencing this? I’m 33 weeks and I’ve been having really really bad back pain at night. I’m a nurse and work busy shifts daily, and then when i can finally come home and relax..if i sit or lay down, it feels nearly impossible to get up or walk after relaxing due to this awful lower back pain. It’s so bad it gives me a waddle when i try to walk from my bed to bathroom, etc. My back is so stiff and sore and the end of the day that any kind of chores after work seem impossible to complete. I plan to mention this to my OB when i see him again in 2 weeks. Anyone have any advice?