My first major mistake

Ughhh. I made the biggest rookie mistake today and it bothers me so much because usually I would never make this mistake. I ran out of diapers in the diaper bag today. At least I checked for a new diaper before I took off his dirty one! Ughh!!! I have never forgotten diapers for him and now the poor kid is sitting in a dirty one until we can get home. I feel terrible.