Resting Heart Rate

Hello all!! 3 years ago I had a missed miscarriage at 10 weeks. I gor my BFP last week snd had betas to confirm. They more than doubled!! I wear an Apple Watch snd my reatijg heart rate has been elevated since a few days before I found out. Today my resting heart rate in considerably lower and I’m concerned that something may be wrong. Anybody have any similar experiences?? I need help to calm my anxiety.