Lower Back Pain/Pelvic Pressure

I fell asleep last night around 11pm. I woke up at almost midnight with the worst lower back pain and pelvic pressure I've experienced to date (36+2 today). The baby was barely moving so I'm not sure it was the baby per se. I feel achy today but the pain and pressure lasted until 3am. I walked around and moved positions in bed...nothing helped and the pain was consistent. I was scared it was labor pains but couldn't time a contraction because it never let up. It went away on its own eventually. Anyone else experience that and if so, how did you get the pain to stop if you got it to stop earlier than I did?