Issues when walking

Jennifer • My name is Jennifer. Married for going on 8 years ❤️ 5 y/o daughter and 2 y/o son. Baby #3 is a girl!

I don’t remember having this happen with my first! When I walk for even a small stretch of time I can feel baby boy really love in my pelvis and I start getting these cramping like pains in my vagina. However they stop instantly when I sit down. I’m 36 weeks exactly! Is this normal?!