Aww mommy, yan talaga ang common sa early pregnancy kasi lumalaki na ang ligaments and muscles mo to prepare for baby! A few of us mums felt the same thing around that time, and honestly it can be a bit alarming pag first time mo, but usually it's just round ligament pain na normal na part ng journey. That said, para sa peace of mind mo especially since it's one side lang, better check with your OB during your next visit or mag-call na if it gets worse or may ibang symptoms, doc can confirm na okay lang talaga. Congrats sa pregnancy mo, mama!