Heart rate

So I’m currently 6+4 pregnant. I have an Apple Watch that tracks my heart rate and since just before finding out I was pregnant, my resting heart rate went from high 60’s/low 70’s, to mid 80’s. The last few days though it’s dropped right back down, it’s sitting at 74 today but has been dropping all week. I had a normal scan on Monday but I have a history of recurrent miscarriages so it’s making me paranoid and it happened when I miscarried my last pregnancy back in November. So my question is has anyone that’s pregnant got a smart watch that tracks you heart rate had a drop in heart rate and everything has been fine. If I hadn’t had so many miscarriages I would t be so worried but every little thing is making me really anxious.

Edit:

Thank you. My miscarriages are making me question everything, and although I know it’s within normal limits, it’s just so hard not to think it’s because there is a problem. I’m tempted to take it off, but I use it for a lot of stuff and not just the heart rate tracker. I just need to ignore that part I think as it’s not helping my anxiety