HELP! Calories??

Here is my training schedule: 5-6 days a week 50 minutes of cardio with 2-3 days interval training 2 days a week 1 hour sessions with Trainer, Cardio and weight training 2 days a week Pilates class Eating 1500-1700 quality calories a day, not junk.  100+ ozs water a day Scale is not really moving much and I am so confused that I am may not be eating enough.  My BMR is 1730.9. Any thoughts on this?