I haven't posted here at 3FC for a while but I just wanted to add my two cents since I went through something similar when I started on my journey
I agree with everyone who said that you may not be counting calories as much as you think. Even what I thought was 2tbspns of peanut butter when I started changing my eating habits turned out to be more like 4. Portions and amounts are deceiving.
But more likely I think you just have to be patient. It was ONLY a month. When I first started tracking calories at 223 pounds, the scale BARELY BUDGED after a month despite incontrovertible math which estimated I should be down 6-8 pounds. But I stuck to my math and then it started going down in whooshes.
I think there are a few things at play when you FIRST start eating less. First... you may be pooping less because you'll have less bulk. LOL! And all that "weight" is in part the weight of your unrealized eliminations. LOL! Sorry to get a little graphic.
Also, healthier food tends to actually be HEAVIER in weight (but not in calories!) because fruits 'n veggies have high water and fiber content than say... pizza or mac and cheese. One is HEAVIER in weight per unit of size but NOT in calories.
Also, I was drinking more water. While water certainly does not add more calories... It does add "weight". And quite a bit at that since 1 gallon of water weighs roughly 8 lbs.
Be patient! And be sure of your math! The REAL "weight" will go down. I promise if you just stick to the numbers. Don't get hung up on "weight" that simply hasn't been ousted yet or may be reintroduced but doesn't represent any caloric value and thus fat. Only time, catabolism of body fat, and peristalsis will win the day