I get that too, not to worry. sometimes it really scares me but

Bubs movements are getting that strange that it feels like he/she is scraping her finger nails along my insides trying to get out, a bit like on alien when the guts explode open and the alien comes out lol

I find that if i lay on my side, ut half propped up, i get it very bad, a very weird scraping feeling, so i try to go over onto my back, but keep my back and neck propped up with a pillow