Aww sayang, what you're describing sounds like Braxton Hicks contractions, totally normal at 39 weeks and doesn't mean baby's coming just yet! Since this is your first, memang lah confusing gila, but the fact that baby's moving and your tummy hardens then soften is actually a good sign; a few of my mum friends went through exactly the same thing and deliver je within a few days or even after due date. Go to the hospital only if you have heavy bleeding, continuous severe pain, or baby stops moving, otherwise just rest and time akan tiba je, but honestly, don't hesitate to call your doctor or midwife anytime you're worried, that's what they're there for!