I used to get a weird feeling too. The baby dropping down into your pelvic opening can create a really odd feeling down there. It could also be caused by your pelvic bone "softening" and changing shape to prepare for birth. If you are not in pain, i wouldnt panic. Good luck and congrats!
I get sciatica pain very bad on both sides of my butt / legs. it definitely hurts. thats the only pain in my butt that I get tho lol I'm 34+3 preg
I'm 35 weeks and what I get is more stiffness like I can't stand up straight until a few seconds later had it with me first also I assume its baby being so low down its a strain on the whole pelvis pubic area.x