I don't know how to tell people

So my fiance and I got engaged in May. We were SO happy and excited. Of course my brain goes into bride mode and I start planning right away. But planning has been stressful and we're not so sure we want to have a wedding next year when there are other big expenses we want to do before a wedding. We've also been trying for years to get pregnant with no luck. We found out I have a hormone imbalance and are getting it fixed. Now what we really want is to focus on having a child and buying a house instead of a wedding BUT we dont want that to be known among family. I don't need the pressure of 'are you pregnant yet?' Or family offering advice. How would you break the news to family that the wedding is postponed