Need help with ideas of things to write in a card to tell his parents we are pregnant!!!?

We are going to see his parents tomorrow and we want to tell them we are pregnant, this is our 2nd pregnancy, the 1st ended in a miscarriage earlier this year in March. We bought a blank card but are unsure of what to write in it, his parents already have a granddaughter and we are telling his mom really,his dad is kind of in his own world lol, we are just not sure what to write in the card, exp with a prior miscarriage, any ideas?