Newbie needing support and advice

[ep0215]

Need some advice - before we finalize the school year time sharing schedule we are still going by what we agreed upon from May. Every week he calls or texts me what the plans are for the coming week. We set the schedule for Monday night, Tuesday and Thursday night, every other week he wants to change it.

Just got a text asking what the plans are
My reply: mom, tues and Thursday night
H: why not Monday - Thursday?

I want to reply without starting a fight. It is too crazy for my 4 year old to be gone almost all week. He works until 7:00 Monday and Wednesday so I would pick him up from school and do dinner and he basically just goes with him to go to bed. Help! How can I reply to him??