Sakit pinggang 35 weeks tu memang common, but since baby kamu songsang dan dah ada tarikh operate, definitely check with your doctor pasal sakit ni, bukan senang nak judge online especially dekat situation kamu yang khas! A few of my mum friends yang operation juga complain pasal sakit pinggang tu, so it could be normal pregnancy stuff or something related to baby's position, better aman aman je. Jangan tahan, just ring up your doctor or KK and describe exactly mana sakit and bila it started, they'll know your case best since they're doing the operation anyway. Hang in there, almost there na!