No -> Don't Worry.
Yes ->
Can I do something -> No -> What the worst possible outcomes and how will I deal with them?
Can I do something -> Yes -> What the worst possible outcomes and how can I negate them to only have best outcomes.
That's not worrying though. Worrying is unproductive fear of the unknown, your steps eliminate the unknown and use logic to solve the problem. That's good, but you need to be able to break the worry cycle so your logical brain can step in.