Going crazy- hubby annoyance ?

Soooooo we work opposite schedules and I'm fast asleep when he gets home and he's fast asleep when I wake up. So when my fertile window falls on a weekday, we really can't baby dance. I keep telling him we have to try since I only release an egg once a month. He's on this "you can get pregnant anytime not just once all month otherwise people wouldn't get pregnant all the time." Help! I have no idea how to make him understand and how to schedule this