When and how to tell my family

My husband and I are ttc! This may sound exciting however i cannot have children. My husband and I decided to have a surrogate carry our baby. We are finalizing legal paper work and our surrogate mother will undergo <a href="https://glowing.com/glow-fertility-program">IVF</a> in November. My husband and i dont want to tell our family or friends until we know the sex if the baby and everything is going as should be. I dont know really when i should tell them though or how to for that matter. I feel like it will be a bitter sweet moment because nobody knows that it’s confirmed i cant carry children and i am afraid of the backlash we are going to get from our family. We are telling our soon to be childs god parents about our plans today in hope of support. Plus its hard to keep quiet. We dont want to go through this alone but we are prepared if we have to. Any suggestions?