Mkay, I wear a Fitbit and I'm taking birth control since my cycle is special, and *every time* I actually start "menstruation" (after placebo days) my Resting Heart Rate drops dramatically. Is this a period thing? A hormone medication thing? It went from 83 on my first placebo day to 78 on my first menstruation day. I'm not worried, I just wonder why my heart seems to work more efficiently. Heart people? OBGYN? Just curious and I love asking random people on the internet lol