One note of caution - 20% of couple experience infertility issues, and have difficulty getting pregnant, so don't assume that when you decide to cut out the contraception, baby will follow immediately. As the old saying goes - make God laugh, tell him your plans.
It doesn't have to be long-haul holiday. There are lots of really great holidays that just don't suit kids. I'd think about somewhere nice and quiet in Tuscany, where you can head in Lucca/Florence/Pisa for a day or two, and chill out/put on weight the rest of the time. Or maybe find a chalet in Chatam, Cape Cod, and spend a couple of weeks eating great seafood.
Actually, you still have a bit of time left ahead of you, as it is fairly easy to take 1-2 year olds on adult holidays. It is when they get older that the really needs lots of entertainment and the maybe even the kids club.