It’s 4-5 carbs per teaspoon so one teaspoon is fine but any more and .....
Grade A foods vary widely in how many carbs they contain. It’s always best to enter your food into the app before eating so you can avoid any surprises. Also, weaning yourself off of sweeteners of any kind will benefit you in the long run.
Use Erythritol for baking and stevia for sweetening tea or coffee