Did I over-React???

[gravy_train]

I can understand why you called the parents to pick their kids up and I can also understand why the parents would be a bit upset. The thing is though - it's your home, your daycare, etc. and if you felt like it was warranted then that's all there is to it. Your clients chose you because they get your philosophy and your behaviour management procedure is a huge part of that.
It seems like you are regretting your decision and worried about what the other parents think about you - one incident isn't going to permanently damage their opinion of you. Instead of worrying about what they are thinking, why don't you just give them a quick call today and have a down-to-earth chat with them? That way you can explain that when you called them you were upset because this type of behaviour needs to be curbed now and you needed to send a strong message that it cannot happen again. Ask them to reinforce that with their children this weekend.
Let us know how it works out!