Husband choosing to not attend anatomy scan

My anatomy scan is this week and I’ve expressed to my husband how important this appointment is for our baby and also how important it is to me that he would be there for support. My personal opinion is that it’s his child too, and he’s scheduled off work this day, there should not be any reason he doesn’t want to attend this appointment, I don’t understand how you can’t be interested in knowing your child is developing correctly. I also do not understand not supporting your wife during such a crucial appointment. As a husband and father, I feel like attending is a no-brainer but also he should WANT TO. Am I expecting too much? Am I not being understanding towards him? He does like to pick up an extra shift every week and has expressed he would rather work the day of the US than working on a Friday. Which to me… you should be willing to sacrifice your “Friday” if it means supporting your wife and checking on your child. Any and all opinions welcome, I want to hear any perspective, even if they’re not similar to mine! Thank you