33 wks Hypertension & Terrible backpain

Hi I'm on bedrest but allowed to move around every 1-2 hrs to prevent blood clots. Anyway my back has been killing me. I've been taking Tylenol extra strength but back pain won't go away. 😭 Idk what labor or contractions really feel like since my first was a preemie due to preeclampsia so it feels like I know nothing. Been having back pain since like 5pm yesterday.