Today I'm babysitting a 4 year old that is potty trained. He tells me when he needs to pee and I…

Today I'm babysitting a 4 year old that is potty trained. He tells me when he needs to pee and I take him to the bathroom. He didn't tell me this time and peed on the freaking couch. I don't want to deal with this my back hurts so much, and I'm tired..