Potty Game

• Isaak's been wanting to play what I call, The Manipulative Potty Game.
• I have him try and go potty before I lay him down at nap and night time.
• He doesn't always go, which is fine.
• He yells out 10 min. after I've laid him down, "Mommy, potty!"
• I go and get him to try again. Nothing.
• 10 min. later I hear again for Isaak, "Mommy, potty!"
• I let it go, and tell him to go to sleep.
• Twice it's gone on for awhile. 
• I go to check on him, and smell poop. 
• Clean up time. I feel guilty for not acting on his desperate call for, "Mommy, potty!" 
• What's a mom to do?