I feel as if I won't make it to my due date because I feel like she's a very large baby right now…

I feel as if I won't make it to my due date because I feel like she's a very large baby right now and I'm almost 31 weeks. I can't even sit down up right without having this uncomfortable pressure down at my crotch, makes me thinks if I bent over she would just pop on out. I can't walk for no more than 30 minutes at a time without my sciatica getting the best of me, and I just can't get comfy at all. I would love if she would come sooner, I'm so ready to meet her. Maybe they'll do a growth ultrasound soon so we can see what we're working with already! My first born was only 8lbs 1.6oz when he was born, and I never felt this big or him roll, toss and turn so much. It literally is as if she is stretched from my ribs to my butt.. Haha 😂