Just for fun, I know that using Fitbit in this way is not very scientific but there is anecdotal evidence that you can use the heart rate monitor to tell if you might be PG, and there is a study done recently where women were able to track ovulation with their Fitbit. This is my chart for this month and the spike does match when I had EWCM so it probably does match my ovulation! Has anyone else found this? Also, has anyone had any unusual HR activity in early pregnancy? I'm not testing until Thursday but I'm hopeful.