Pressure on bottom

I’ve been getting Braxton Hicks I believe for the last three hours maybe 15-10 min from each other. I don’t feel pain and I haven’t had sex in like 3 days but I have so much pressure on my butt idk how to explain it but when I sit and try and get up my back aches and the pressure is just annoying. Anyone going through something similar? I’m 29w2d