Uy, side pain during pregnancy is pretty common, pero since you're 6 months along, kelangan mo talaga makita ng OB mo para ma-check kung ano talaga ang dahilan, mas safe na yan, lalo na para sa peace of mind mo. Could be round ligament pain, but it's best to get checked to make sure it's nothing serious. A few of us moms nag-experience din ng ganyan during pregnancy, pero laging sinabi ng doctors namin na importante i-report agad. Don't worry, most likely okay lang, pero huwag mo palampasin ang check-up mo, ha. Rest muna habang naghihintay ka ng appointment, and if it gets worse or may other symptoms, go to the hospital na. Take care, mama!