Affair discovered 3

[STH17]

When W picked up son today I told her I didn't know if I would be able to watch son anymore because of possibly having to go in for jury duty. W said she would figure something out. I did have to go in today, but I am done now and was told I don't have to come in at all tomorrow. So do I keep the original agreement I made to watch son and call W to say I can watch him, or say nothing and not tell her about not having jury duty? The first one feels like the "right" thing to do. I'd also get to spend a bit more time with my son, even though I should be working at school.