Pelvic/Groin Pain

I’m 19 years old and 36 weeks pregnant with my first baby, but today I had some really bad pelvic/groin and hip pain that made it pretty hard to walk. I had a prenatal appointment today but I decided to reschedule it so I could rest and see if that would help at all. I plan on asking my OB about it as soon as I see her within the next couple of days, but I was wondering if anyone else had experienced anything like this or if it’s normal. Any advice would be welcome, thank you!