Pelvic pain/cramps

Hi, I’m having trouble deciding if this pain I’m having is normal round ligament pain/stretching, or something more. For the past week and a half I’ve been having a lot of pelvic and lower back/hip pain, and I swear I can feel my pelvis grinding when I walk. I’ve been feeling pressure when I sit. It’s gotten a lot more intense in the past few days. It’s almost unbearable to walk now, all I feel is what I can describe as the resistance you get when you rub two rocks together. sitting is really uncomfortable and I feel a lot more pressure now. I’m 16 weeks and I don’t remember having anything like this with my first pregnancy. I have an appointment Friday and I’m definitely going to bring it up but I am curious if anyone else has had this and what it was.