How would u tell ur partner your pregnant

Ok so my names Dannielle and my partners name is Blake when my partner was younger he got told he may not be able to have children we've been trying for a few months now and if been thinking of when the day comes and the test comes back positive how I would tell him as i no it will make him and me very happy but I can't think of a magical way to tell him thought I'd put this up to see how other people would love to tell there partners and to get some ideas x