Hear rate on fit bit=pregnancy?

I have been wearing a Fitbit blaze for about two years now so it’s easy to see changes in my readings to correspond with what was happening to me at that time. My resting heart rate is usually in the low 50s. Around 3/14 I ovulated so of course we did the baby dance. I just noticed today that a day or so after that my heart rate gradually started to rise and now I’m in the mid 60s with it still rising every day. Has anyone experienced this before with a pregnancy? I took a test this am and saw the faintest line.