Congratulations on the one month!
You're doing amazing. Take a deep breath and don't over think it. It's such a great feeling when you hit a milestone and realize "Yes, I can REALLY do this!". Some call it the pink cloud, I like to think of it as healing. Your mind is healing both physically and mentally, all of your body is healing. It's an overwhelmingly great feeling.
Instead of being concerned about confidence possibly leading you to relapse turn that around. Be confident that you made it one month and draw on that strength to realize that this can be done.
Vigilance is always important but sometimes I think we get so concerned about going backward we forget to focus on the amazing work we've done.