Still unsure about travel dates

Our agency is trying to secure a Consulate Appointment (CA) for us the last week in September and if they're successful, we could be leaving around the 17th. Otherwise we may not be going until late October. BUT, we have to wait for our amended I171H (orphan visa) to come in the mail before we can go anywhere and that could be cutting it close for a September departure. I am not much of a "fly-by-the-seat-of-my-pants" girl anymore, much more of a planner, and this is stressing me out!!!