Hi Dayan! Oo, normal yan sa pregnancy, maraming sa amin nag-experience ng ganitong side stitch feeling, lalo na around that time kasi lumalaki na talaga ang baby at umuunat ang ligaments mo, pero since it's your first time kaya naturally worried ka na rin hehe, I getcha! A few of us checked with our OB din just to be sure kaya I'd say go ahead and mention it sa next checkup mo para peace of mind, better safe than sorry, especially pag first baby pa lang. For now, try resting, warm compress, or just changing positions kasi sometimes it helps, but definitely let your doctor know para sure na okay lang lahat with you and baby.