I don’t think anyone here believes you are causing harm to you baby.
I think you are doing great and you should not interpret anything said here thus far as a criticism.
(I don’t think you did, but I want to make sure your mind is at ease on that)
Your plan to keep these carbs under 20gr and increase your fat a bit is awesome.
As to your weight control, we don’t have your complete history with food intake over the years.
If you’ve maintained the desired weight through a calorie in calorie out method for some years, it’s entirely possible that your metabolism has slowed down over time.
Eating these 500 calories more will not only support BF, but (if you are with a slowed metabolism) will improved your metabolism and should not affect your weight negatively.
If anything, it might be just what you need to start loosing weight in a few month’s time.
Your metabolism does not adjust overnight. It slowly changes over time.
Stay in caloric deficit long enough and it will eventually adjust to that level of energy expenditure.
Stay in caloric surplus long enough and the same will happen in the other direction.
You will feel better (skin look better, hair grows stronger, more energy, regulate temperature better, better immune system) by burning more energy without having to increase activity level…. and regulating your weight will also be easier.

