Quoting Mandy Schlatterer:" My son is 27 months and still not potty trained. He's peed in it at random times though. Is this bad?"
I don't think so.
The more you push potty training on a child who isnt ready, the more likely they will "relapse." Boys generally take longer than girls to be fully trained, but it's good that he is trying. Just keep giving him lots and lots of praise for going and a special treat! He still has time!