Groin pain during bowel movement

Just about 34 weeks... started having pain and cramping (almost like a Charlie horse) on my inside of my thighs in my groin when having bowel movements. Haven’t noticed it at any other time except during a BM, but seems to be getting a little worse. Anyone experienced this before? Have an appt Friday and definitely will talk to the doctor then, just trying to see if anyone else has had this and if it’s something I need to really worry about.