Nap for a 15 Month Old?

Caitlin
So my son is 15 months old, and we're home alone today. At daycare he naps for an hour at 10:30, and again at 2pm. I'm ten weeks pregnant and desperately tired. My son naps for my husband and obviously for the sitter, but not for me, no matter how I follow the schedule and their instructions (fresh diaper, water bottle, soft blanket, and set the swing to 3). What can I do to help him to rest? He acts like he wants to play but melts down.