Congratulations! I’m very happy for you! You’re a great friend for considering the feelings of others who are trying for baby, but your happy news is definitely worth celebrating, and if they are true friends, they would never hold it against you for sharing:)
Perhaps you don’t have to update them too often about baby’s progress unless they ask? But I think it’s perfectly fine to share milestones during the pregnancy and even after birth.
Congratulations once again:)