We started potty training this week.
Sometimes having the bottom covered (wearing undies) can make a child forget he's potty training (thinks he's still wearing a diaper), so more accidents can occur. You can give it a few more days of the naked method, and/or you can try getting some plastic covers to put over the undies to help contain the accidents which will make accidents less pleasant for your ds. You can also try alternative undies to see whether they're more comfortable for your ds -- maybe looser undies, thicker training pants, etc.
hogansmom2006, Hi and welcome to the Toilet Teaching board.
There is a transition period and it will take some adjustment. My best advice to pass along is to start like are training from day one. Remind your DS to use the potty. Also many brands of boys underwear run small, so buying them one size bigger then they normal wear helps as they are looser. I hope that helps. Also check out the folder below as there is a post on tips for transitioning to underwear. Please keep us updated on your DS progress.