I need to know❗️

Ashlee • Hi everyone I'm a first time mom expecting a baby boy in about 4 weeks give or take.
Has anyone ever had this problem I'm a first time mom and I'm starting to have the pian in my left butt cheek. It happens any give time when I walk when I sit even trying to put pressure on that leg it hurts. It's gotten to the point where it's bringing tears to my eyes does anyone know what this could be