Aww, first time mom ka pa lang kaya normal mag-worry! But honestly, kahit gaano kalaki ang buntis mo, any lumpiness or heaviness on one side lang is something your OB should check out, please bring it up sa next visit mo, or if it feels off talaga, don't hesitate to call your clinic. A few of us moms experienced different things during pregnancy, pero better safe than sorry talaga, lalo na ngayon ka pa lang early pa. Your baby and your body are doing something amazing, pero the doc needs to make sure everything's balanced and healthy. Take care, mama!