Round ligament?

What does round ligament pain feel like around 13 weeks pregnant? The last couple days when I’m up and walking I’ve been getting a light but sharp feeling (does that even make sense?) a lot lower than usual, like in the area where my pubes grow. Like right in between my pelvic bones I suppose. Sometimes it’s on the left, sometimes right and sometimes middle. I say light but sharp because it doesn’t feel like a dull period cramp, it’s more of a sharp feeling but it’s pretty light and doesn’t actually hurt? And it comes and goes pretty fast. What could it be? Could this be my uterus stretching?