I've had them too lately. Especially when I'm out taking a brisk walk. It's because our uterus is growing! Yay!
Here's a definition of round ligament from wikipedia.com: The round ligament originates at the uterus horns, that is, the point where the uterus and the uterine tubes meet.This ligament leaves the pelvis, passes through the inguinal canal and continues on to the mount of Venus (outer female genitals) where its fibers spread and mix with the tissue of the mount of Venus. The function of the round ligament is maintenance of the ante-version of the uterus (a position where the fundus of the uterus leans ventrally).
Here's a definition of round ligament from wikipedia.com: The round ligament originates at the uterus horns, that is, the point where the uterus and the uterine tubes meet.This ligament leaves the pelvis, passes through the inguinal canal and continues on to the mount of Venus (outer female genitals) where its fibers spread and mix with the tissue of the mount of Venus. The function of the round ligament is maintenance of the ante-version of the uterus (a position where the fundus of the uterus leans ventrally).