Good noon, mama! First thing, if the pain gets worse or you feel anything unusual, go see your OB right away, ha! Better safe than sorry sa pregnancy. That said, a lot of us moms felt random twinges and mild achiness around 4 months, round ligament pain is super common at that stage. But since this is your first time, definitely mention it sa next checkup mo so your doctor can check and give you peace of mind. Kasi every pregnancy is different, and your OB knows your case best! Keep an eye on it, and don't hesitate to call kung may changes. You've got this, mama!