Co-parenting nightmare...

We try our best to be nice and civil with one another. However today I'm frustrated. My ex was supposed to have his visit with our daughter from July 1st and bring her home by the last of the month per our court agreement. We work together on comprising. He wasnt able to afford travel expenses (his responsiblity, since he mover many states away)at the time so the visit was pushed back. His parents are driving up for a family reunion and they will be picking her up August 2nd. Our daughter's birthday is September 16th we decided earlier in the year that he would have her for her birthday since he did not last year. I told him it was fine to just elongate the visit so she could be with him for her birthday. He agreed, my daughter has asked and asked cause she wants to spend her birthday with daddy and his family she will be 5 and this will be her last birthday before starting school and the last year she can spend it with them. He has decided to bring her home early(before her birthday) cause he is attending a wedding in md and i live in de. I am pissed that he just doesnt get it. She is going to be devastated. I was mean. I told him he was being childish for choosing a friend's wedding over his daughter. I am pregnant, am I just being hormonal or is he in the wrong?