bring your followup card and go to hospital asap lah. i had that few weeks ago. though i was not in labour at that time, checking and monitoring is important.
hard to say when the labour starts. fortunately, i did not have it in my last admission. it is truly boring to stay at in the hospital but it is also important to be examined by doctors as apart from labour, there can be other possibilities like bleeding. though i did not go into labour last time, the doctor reminded me (just before i left the hospital) to go back to the hospital immediately if the same situation happens again.