Potty training blues!

Today we had a major set back with Ethan and potty training. He had several accidents today. The first one was he was messing around on the way to the toilet and just didn't get his underwear off in time. The second one was at nap time. Josh stepped out of the room for a second and then Ethan peed on the side of his bed. The third accident he was kind of doing a potty dance around the room and I told him to get on the toilet. He got to the toilet but wasn't able to get his clothes off in time. We tried to explain to him that tomorrow he is going to a big boy class and that if he has an accident while he is at music school he won't be able to go back. So my fingers are crossed that whatever caused him to have accidents today has passed and that tomorrow he will be on track again.