Hi my son will be 3 next month and for 5 days now we have been wearing underwear and pull up at nap time and a diaper at night. I've been taking him every 30 mins to go potty. Most of the time he fights me with it. He keeps having accidents. All he does pee pee in the potty no poo poo. He never tells me he has to go. Am I doing ok or is there something else I should be doing?