Could anyone describe what round ligament pain feels like?

AJS012 • #1👶💗 #2 👶💗 #3 on the way

This is our first pregnancy and we are just 15 weeks. But I keep getting these sudden dull throbbing like pains that feel like they are really low in my pelvis almost in my vagina... I dont know what they are and I'll see my doctor in a couple days and dont really want to call. They come and go occasionally, dont last long, and there doesnt seem to be a pattern to them.