Sabar ye mama, 16/5 dah dekat! Honestly, kekurangan air ketuban time sulung tu lain situasi, so this time boleh jadi very different, tapi sebab ni ada medical history, definitely kena follow up dengan OB/GYN mu closely untuk confirm baby's position, the amount of fluid, and whether normal delivery is safe for you both. A few of my mum friends yg ada history of c-sec actually managed normal delivery second time round, so it's possible! In the meantime, besides the exercises you're doing, stay hydrated macam gila (seriously!), walk as much as you can, and relax, stress pun boleh affect labour. The backache and thigh pain are normal in late pregnancy, tapi jangan hesitate to call your doctor kalau anything feels off, okay? You're doing great, mama!