You need to stay away from him completely. Either you or him need to stay somewhere else. I had a similar issue when a client if mine had the measles. My doc told me to cease all contact until they had a note from the doc saying they were clear of all infection and were no longer contagious. I know it will be difficult, but you really need to stay 100% away from your husband because measles is very contagious.
Call your OB asap and ask. She really needs to monitor both you and the baby, make sure everyone is okay.