How accurate is the Fitbit?

It looks accurate to me.

I can't speak for you, but I know for myself because of the myth that petite women don't need to eat much more than 1200 calories, I always had it in my head that I shouldn't be eating much food and that near 1200 calories should be enough for me. That being said, I'm 5'3" and I started using MFP at 139 pounds. I was already within a healthy BMI range, but 139 didn't look right on my body type. I went with the 1200 even though my Fitbit readouts were telling me I could eat a lot of calories back. I used to eat no more than 25% back because I thought there was no way I could be allowed to eat that many calories. Looking back, I was losing at a rate of 2.2 pounds per week. I didn't know how fast that was at the time; luckily for me I had the BF% to sustain that deficit for two months. By month 3 I felt worn out, visited the forums here and learned a bunch of useful information.

Fast forward to now. I maintain between 110 and 113 pounds and my TDEE is 2000 to 2300 calories per day on average. I've used, and trusted, my Fitbit for four years now and it's been spot on. I'm mentioning this for you or anyone else who comes here with a similar issue to highlight the fact that losing weight doesn't mean being starving. Losing weight doesn't mean you have to be on minimal calories for the rest of your life to maintain it. Trust in your Fitbit and trust the process. If after a month or so, you notice your deficit doesn't match up with your rate of loss, you can always readjust. A poster here used to always write: "Whoever can eat the most and still lose weight wins." and it's the truth; it's the best road for sustainable weight loss.