Oo, normal yan sa ganitong stage ng pregnancy, mama! Ang baby ay bumababa na towards the pelvis kaya parang heavy and sore talaga, lalo na pag naglalakad, a few of us moms felt exactly na yan a few days before labor. That said, lalo na at malapit ka na sa due date, best to message your OB or check in with them asap kung hindi mo pa, especially kung sobrang sakit or may ibang symptoms, para ma-monitor lang nila if it's just normal heaviness or something else na kailangan i-check.