Constant Lower back/Butt pain.. is labor near?

I’m having some really really uncomfortable extremely lower back pain and butt pain. Feels like my muscles and ligaments are trying to separate! It’s not coming and going, it’s constant for a few hours then it’ll get better. Its been getting worse over the last few days. I do position changes in bed and when I’m awake and I bounce on my ball. I also walk as much as I can handle. is this a sign of labor? I am 38weeks and 2days