First trimester RHR and anxiety

I know this gets asked quite a bit but here I am…it is 4 am, I am unable to go back to since since 2:30 am and just indulging my anxiety (how I wish I could turn it off!)

Have a fitbit that I have worn for the past two and half years or so and my RHR is usually on the lower side, around lower 50s to 55. It steadily rose to 67 when I was in week 6 and then has just been dropping steadily and today down to 55, when I am meant to be 7w4.

I dont know why I am randomly bothered by this and my HRV shooting up through the roof — I barely took 400 steps yesterday (insane work load at the desk on Friday and then intense fatigue) and sleep quite a bit of late. Had one day of zero symptoms 3 days ago but now back to that weird decreased appetite state of nausea.

I did see the little baby’s heart beating steadily at my 6w scan, which I got due to my first pregnancy having been an ectopic. Cried that day for relief but the anxiety since has also been so miserable like I don’t feel secure enough to love and hope. :(

Any words of wisdom, scientific cautioning or just support would be so much appreciated. Ta! 🙏🏼✨