Should I go in?? 36w 6d pregnant .

I’ve been having sex quite a bit lately (couple times a day for a few days) & I’ve been having an immense amount of pressure in my bum/lower back & lower stomach yesterday & today. I’ve also have been pooping a lot this past week but even when I don’t have to go anymore I still feel pressure in my lower back/bum & lower stomach. what could this be? Should I go in to be checked?