Hello. Thank you for coming to JustAnswer with your question, and welcome.
In general, people who are active can eat more calories because they will use more calories. However, if you want to lose weight, you will need to eat less calories than you are using. So, if you are not losing weight with the increased activity, it is because you are eating more to compensate for the energy burned during your exercise.
You need to determine how much you are eating now, then reduce your caloric intake by 500 calories a day for an approximate weight loss of 1 lb. per week. You can reduce your intake by 1000 calories for a loss of 2 lbs per week. Keep in mind that weight loss faster than 2 lbs per week, or reducing your caloric intake below 1200 calories per day is not healthy, as you will not be getting adequate nutrients.
In addition to watching calories, you need to also make sure you are eating a variety of foods, with a balance of each food group to get in necessary nutrition. Also, eating regular meals throughout the day (smaller and more frequent is best) will help your body's burn more calories. If you are going to weight watchers, I am sure you are already aware of these things.
So, for now, start by keeping a food diary or log to see where you are as far as caloric intake. Then go from there.