As of Nov. 11, you can find this model for under $100 at Amazon ($99.95), saving you $60. This deal covers several colors so ...

But these aren't your only options. We've rounded up the best Fitbit trackers and smartwatches for a range of uses and budgets, including options for iPhone users and more fashion-focused options ...

But if you have an irregular period, you'd need to take an ovulation test and input the results for a truly accurate reading... which is kinda annoying. The Fitbit also can't track pregnancy —some ...