It could be sciatic pain. Try looking up stretches for it. It's good to do those stretches anyway.
I am only 6 weeks and am feeling a lot of butt pressure
Sorry no pain like that here. Thankfully. Hope,you feel better soon.
Oh yes! I started experiencing sharp stabbing rectal pain at 20 weeks. I'm still not sure what causes it, but I'm now 30 weeks and everything seems fine with the baby. I'm chalking it up to nerve compression from a larger uterus. Good luck!!