Question

If you're not losing weight on 1200 to 1300 calories, it's very unlikely that your macro allocations is the problem.

1) Are you being impatient? Have you decided after three or four days (or less) that you can't lose weight on 1200 to 1300 cals, while simultaneously starting a new exercise program, hitting a water-retention phase in your monthly cycle, changing your diet in a way that has increased the weight of food passing through your digestive system, and stressing out over losing weight?

2) Tell us your height, weight, gender, age, and general activity, and we can take a shot at figuring out whether you might be among the very small percentage of people who need to eat less than 1200 to 1300 calories to lose weight.

3) if you've given the effort at least a few weeks (better yet, a month) and your stats suggest you should be losing weight, consider whether you need to tighten up your food tracking. Honestly undercounting one's calories is extremely common. Are you using a food scale and weighing everything you eat, at least to begin with? Don't assume a package of food contains the amount of food it says. Weigh it.

4) If none of the above solve the mystery, you might want to see a doctor. There are medical issues that can affect the amount of energy (calories) your body uses.