You could be calling hoping they can tell you the fix over the phone, but that would depend on what problem you're reporting. Or you could tell them you wanted an idea of when they would be able to take you, but you need to check with your husband's schedule to see if any of their openings works for him.
"Say, I'm just trying to find out if it would be immediately or several days before we could get an appointment. I need to make arrangements for alternate transport first."
If they offer a loaner car, "I'm really not comfortable driving cars that don't belong to me; I have a friend who offered to pick me up and I need to check with her first."
Time to build a bigger bridge.