Husband don't know I'm pregnant

Me and my husband fell on hard times last year in October. We moved in with his mother with our two year old . Before we moved we were trying for another baby but he suggested we wait till we move and get more financially stable, I agreed so I got on the birth control pill.

I soon decided to stop taking them because I really want another baby but I didn't actually think I'd get pregnant. I got a positive test today. I don't plan on telling him until we move, we should be out his mom house before the baby gets here. Should I tell him now? Has anyone been through a similar situation??