Apple Watch tries to measure the so-called active calories.
This is the estimate of the calories burned due to activities such as exercise.
Your total caloric requirements are your basal requirements, plus the requirements for your level of activity.
Here are some caloric estimates from the US Government, to give you a range to work with:
https://health.gov/our-work/food-nutrition/2015-2020-dietary-guidelines/guidelines/appendix-2/
Your particular requirements can be above or below those guidelines.
I’d (also) watch the total weight, and not focus on the Watch caloric estimates.
The Watch caloric estimates can be... off.
Calibrate your Watch, too:
Calibrating your Apple Watch for improved Workout and Activity accuracy - Apple Support
Weight measurement is best approached cautiously too, as muscles are dense, and can weigh more than fat. If you’re doing strength training for instance, you may well see a weight gain. And weight loss can or will shed both fat and muscle.
Have a chat with your physician about all of this, as they’ll be in a much better position to discuss your particular dietary requirements, and your particular metabolism.
See your doctor...