E.W.
I don't understand. You just started over the weekend. Did you expect him to get it that easy. Boys rarely pick up patty training easy(I have 3 boys). My boys were almost 4 to 4 when they were potty trained. My daughter was easy and was trained at 3. Boys are late at most things. On top of that each boy comes with his own unique personality. You need to be patient and do not punish him because you want him to be potty trained now. No 2 kids are alike and do not listen to "opinions" on what the "right time" is for potty training. Treat each child uniquely and realize some will learn early and some will learn late. You may not want to hear this but he may not be ready for preschool. Consider what is best for your child and find a program that potty training is not so important.