Groupon has a doorbuster sale for a Fitbit charge HR for $ 90 . Make sure you ' re getting a new one , not a refurbished one , which they also sell . I love my fitbit . I have been pregnant twice , and both times my resting heart rate rose by 1020 % over the course of a week starting around ovulation and stayed high until my loss . The heart rate does vary slightly from day to day though , so I don ' t think it would be accurate enough to predict your fertile window . Still very fun , and useful for fitness in general <| sep |> Is it really assuming the worst when the guy pretty much said he ' s the worst ? It ' s not like he came into this promising sunshine and rainbows . I don ' t think it ' s a huge leap to assemble he ' s a dick . If someone tells you who they are believe them .