Round ligament pain?

Ill be 21 weeks on Sunday and woke up this morning with a stabbing pain in my lower right side. Close to my hip  I guess. It's not terrible, more annoying than anything. It comes and goes every once in a while. Baby girl is moving around so I'm trying not be too concerned but I'm a ftm so everything is slightly alarming to me. Lol. Any advice would be appreciated :)