Panic won't help if you think your water has broken. Take a minute to take a deep breath or two and collect your thoughts. Simply find the closest bathroom and make your way there. If you're at home you're probably going to feel more comfortable. However, if you're out, simply excuse yourself and go to the bathroom. You don't normally experience such a huge gush that everyone near you would need to worry about getting their shoes wet, normally it's a matter of your underwear being wet.