A.C.
My son was potty trained at 2.5, too, but it took several months before he started having dry diapers at naps and overnight. Once he was dry for a few nights in a row, I just asked him one night if he wanted to wear a diaper or underpants, he chose underpants. No accidents the first week, then a few the second and third weeks, and we've been fine ever since! But I wouldn't worry about it until he has consistently dry diapers at night! Otherwise, if you try too soon, you'll just be waking up every night to change the sheets, that's no fun for you or for him!
Good luck!