Did I bomb my interview or was it successful?

I just had an interview today ata learning center and I'm not sure how it went. I answered most of the questions really well, but there was one question th!t I think I flubbed b/c i forgot the name of a book I used for a lesson. However, I said that I was really good with kids and I loved working with them. The woman that interviewed me was really nice and kept saying excellent after some of my answers. And it went about 15-20 min. So...what do u think? Did it go well? Thanks in advance!