Aww mama, I know waiting is SO hard, lalo na first time! Yung back pain na yan madalas sign na baby is dropping or positioning himself, pero since wala pang contractions sa tiyan, it could just be ligament stretching or Braxton-Hicks, a few of us had the same thing days bago mag-go into labor, pero iba-iba talaga ang timeline ng katawan. I'd really suggest calling your OB about the back pain just to make sure everything's okay, especially since you're already past due date, hindi lang para sa peace of mind mo, kundi they might give you specific tips kung ano ang pwede mong gawin next. Kaya mo yan, mama, 8 days pa lang and baby will be here!