Ay, at 39 weeks na kayo, understandable ang worry! Ang nausea at back pain ay normal na symptoms towards the end, pero kung sobrang sakit na ng balakang at ang suka ay hindi tumigil, kailangan na kayong makita ng doctor agad para ma-check kung anong nangyayari, baka positioning issue lang ng baby o something na kailangan i-monitor. A few of us moms experienced similar, at some needed to change positions a lot or do light walking to feel better, pero honestly sa ganitong late stage, better safe than sorry talaga, kaya patingin na sa OB ninyo agad para ma-assess properly.