Fitbit has just launched what they say is one of their most requested features: Period tracking. The app and smartwatch can now show you where in your cycle you are, the better to correlate cycle data with your nutrition and sleep.
Each day, screenshots show, you can mark whether and how much you're bleeding and Fitbit will add that to a calendar. If you like to keep track of what's going on with your cervical mucus (that white/clear stuff you produce a week or two later, during the time of the month you're most likely to conceive), you have a few buttons to enter data from that, too.
You can also enter when you have protected and unprotected sex, and there's a button to note when you've taken emergency contraception, labelled "morning after pill".
That's it, though, so it's unlikely to replace a full-featured fertility app, if you already use one. Fitbit doesn't provide any tools for tracking basal body temperature, birth control pills, pregnancy tests or ovulation test results.
So for now, this is basically just a period tracker. Fitbit says it will be turned on by default, under a tile labelled "female health tracking", for users 13 and up who have selected "female" in their profile. (If that isn't you, you can turn it on in settings, or turn it off if you'd rather not see it.) Read more here on how to use the new features.