Follow the 5-1-1 rule. Dont wait for the water bag. if your contractions happen 5 minutes, last for 1 minute each, and have been happening consistently for at least 1 hour. However, I suggest go b4 this happens. Sometimes labour moves v quickly. Travelling takes time and queuing takes time too.
yes time ur contractions to see the consistency. if you can labour in/near the hospital vacinity is good also. if suddenly fast progression, you have already reached.