Glad to hear you are straightening your teeth. You are going to love it. Usually, the orthodontist who put your braces on should tell you how often to come back. That being said, it could vary depending on how much they need to move your teeth and possibly other things (extractions or jaw surgery). When it comes down to only the braces part you usually get your braces checked every 4-6 weeks.
My best to you!
William F. Scott IV, DMD