I find it very hard to believe that your limit would be 1224 calories a day. That seems way to low. How tall and old are you?
Your limit goes up when you enter exercise calories as it subtracts those from what you've eaten already that day. If you're going to eat 1224 calories a day, and burn off 335, PLEASE eat those 335 back AT LEAST. My main concern being, when you're down to 200 or 180 lbs, How much are you going to eat? 800 calories a day?
That number just seems very unhealthy to me. I figured out your BMR assuming that you're 5'0 and 20 years old, and you should be consuming 1200 calories to lose 2 pounds a week being sedentary
. I'd seriously think of upping your calories.
Use this site
to figure out what your calories should be given your information and how active you are.