Does my cat need to rest while pregnant?

Let's be honest. It's a cat and they're going to rest pretty much whenever they want to rest. We all know the lifestyle of a cat. I think the biggest thing is to avoid stress. Now when we say "rest", my mind immediately thinks sleep. More importantly, though, you should avoid exposing them to stress as much as you can.

If there's a way to give them their own little space where there are no other animals in there harassing them, that's ideal, especially if they don't do well with the dogs or other pets in the house. Keep them separate so they don't have to be traumatized by those kinds of things. I think stress is the bigger enemy there.

Let them set their own activity level. However, it's safer to keep them indoors as predators could pick them off as they get slower with progressing pregnancy. They will usually set their own activity level.