36 weeks and 2 days.

I’m in a lot of pain tonight resting on a heating pad, about to take a warm bath hoping to ease my back so I can sleep. My back has been killing me for the last 2hrs. I’ve been having period type cramps with it. The pain is now radiating down my tailbone, hips and thighs. Could this be back labor or early labor? I’m just not sure because nothing feels timeable if that makes sense. But I’m hurting pretty bad and really miserable 😩 and I should note I haven’t done anything strenuous to bring it on and even when it first started happening I was just sitting on the couch watching tv. Any insight would be helpful.