I'm the same but I'm 38+1 ive been having tightenings (bh) lower back pain to the point where it feels like I can't bend, but my son is facing my back so his feet are there so could be his kicks. I've been told he is a bit over average, but not being offered a c section so trying anything I can at the moment to get him moving! I'm trying walking and long warm baths at the moment don't really want to do any remedies that are not natural x.
You can try speed bumps squats or what i did with my second pregnancy is take a really hot water shower/bath i did it in the am. By the end of the night my water broked :)