Website progress tracker

I’m working on an application that has multiple tasks that need to be completed in sequence (e.g. think placing your order with amazon). We have a progress bar at the top of the web page which shows which step of the process you are in.

My question is with a unique situation we’ve come across. For the application in question; the number of steps in the process will vary. At one point; the user is asked to select an option in a drop down. Depending on their answer; they may have 2, 3 or 4 remaining steps. 2 of these steps are always the same.

I was wondering if anyone would have a suggestion as to how to handle this. I think it would look weird and confusing if the number of steps in the task progress bar starts changing based on the users selection.