high heart beat

Marissa
Everytime i go to the doctor, they say my heart rate and blood pressure is fine, but im always sitting down, and its early, so i literally get out of bed, drive there, and thats it. 
I have the fitbit charge 2, which monitors your heart rate. My husbands heart rate is usually between 50-60. Just me walking around for 2 minutes makes my fitbit buzz and tell me to relax because my heart rate is going above 120, which is supposed to happen during intense exercise. 
Now i know when you're pregnant your heart rate increases. But im wondering if thats bad? I wanted to start running with my husband but if just walking is making it go up that high, im scared.
I asked my doctor and he said maybe i was just over heating, or something but i wasnt. Anyone else have this?

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