Sayang, please call your doctor or go to the hospital now to check, 38 weeks without labour signs needs proper monitoring, especially since your second came early at 37 weeks. Your swelling and back pain could be normal, but better to get checked properly so they can advise what's happening with this one. A few of us mums have had different labour patterns with each baby, so don't worry, but don't wait lah, go get checked out today okay. Jaga yourself and baby!