It's unfortunately normal, Jenna. Both of my boys did that. My 3 1/2 yr old is regressing again, but we just moved to a new state so I am hoping once he feels more settled, it will stop!
Just keep encouraging him and try not to make a huge deal out of accidents. The "newness" of going potty has worn off and he's too busy to stop and go now.
Hang in there, and huge hugs for the toddler mom!
ETA: Watch him carefully. My oldest, once he started standing to pee, well, he tried standing for everything!
