I'm a ftm and just curious idk what it means but I'll be 38 weeks tomorrow I've been having more…

I'm a ftm and just curious idk what it means but I'll be 38 weeks tomorrow I've been having more pelvic pressure when i walk or sit on my yoga ball and now I have alot of pressure in my belly itself like as if something was sitting on my belly and if i sneeze or something the whole thing cramps up. Is that normal? If so what is it?