It's been my own experience that if there's ever a discrepancy between what my body says and what some tracker/expert/software says, I need to trust my body every time. The pros of doing that are: healthy metabolism, plenty of energy, food peace. The cons of taking the software's side are: rebellion, obsession, exhaustion and a seemingly total inability to stop eating. That's me, but maybe someone else can relate. Tracking my intake against expenditure was exceptionally counterproductive because it had me thinking about food and what I could or couldn't eat all damn day, which would be survivable for short periods of time and then bite me in the face. The chaos it was causing in terms of self-doubt and gasping for food made it not so helpful. I quit tracking anything for quite a few years. I had an interesting insight last fall when my husband and I started eating more plant-based. I used Cronometer software for awhile to make sure I was meeting my nutrient needs over time. I didn't want to become deficient in something dumb because my eating was unbalanced. The big gobsmack there was that I was routinely (as in every day I spot checked over a couple of months) eating like 600-900 calories more than my Fitbit said I burned. I had a good laugh at the absurdity of it all, confirmed that I wasn't going to get rickets or scurvy, and backed away from the math altogether. It's clearly goofy as hell. That's a long-winded way of saying that if you're basing what you eat on a fitness tracker, consider that it might be waaaaaaay off your actual needs. Same with other people. What other people eat and what they weigh as a result has no bearing on how much food I need. I eat quite a bit more than my husband, for example. I used to feel not-dainty about that. Once I quit comparing myself to him, or friends and relatives, or people online, it became much easier to eat according to my actual needs, and to experience all the benefits of doing that.
You might find that you're happier, less hungry, and getting better results when not pushing the calories burned through exercise. If I wanted to be really hungry and tired and retain a lot of water, there's nothing like too much intense exercise. It took me a long time and a broken leg to realize the miracle of rest and recovery on body comp, appetite, and mental health.
Fitbit does do menstruation tracking. It also has a monthly premium membership available. I’ve never found that worth paying for, but it’s nice for however many months are free when you buy one. That gives you access to more follow-along workouts and guided meditations as well as more detailed stats but, meh, I’d rather use the $9 for an extra streaming channel or something. Fitbit has tons of features without it. It also has great battery life compared to Apple Watch, five days compared to less than one day. If I’m going to wear something for daytime activity plus nighttime sleep tracking, I don’t want it to need long charging sessions every day. I’m curious about the other trackers but don’t have any personal experience with them.