Heart Rate Monitor for DDP Yoga

I have been doing DDP yoga for the past month and a half. I love it! I have been yo-yoing 3-5 lbs for the last 3 to 4 weeks. No change in inches either. My friend suggested that I make sure I am counting exercise calories correctly from the Yoga- I am currently only listing 190 per 30 mins. I think I need to get a heart monitor to more accurately record my calories burned. I have a fitbit that I love and works well so I don't need to replace pedometer and I only run when I am being chased- which is never. Any suggestions would be great. Thanks!

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