If you have any consern about going into labor during daycare hours just make sure that you have a good plan in place. At about 35 weeks of pregnancy have the parents update their emergency contacts and find out what plan they have in place in case such a thing happens. You could always arrange with a friend/relative/neighbor to be YOUR emergency back up (in case you need to leave before parents can arrive to pick up their children).

But remeber, you have done it before and believe me I am SURE you will recognise the signs of labor.