Sudden decreased resting heart rate 10 weeks pregnant

Hey guys I wear an Apple Watch and check my resting heart rate daily. It’s usually anywhere between 69-78. The last two days it has significantly decreased. Yesterday I was on a pontoon and really sitting the whole time except for dipping in to potty and it was 42 for the average. And today so far it’s 50 but I’ve been resting and laying down most of the day. I have my next doctors appt in two days, I’ll be 10 weeks. Should I be concerned about this sudden decrease in resting heart rate? Pre pregnancy my rhr was about 58-69. Any help or advice would be appreciated! Thanks in advance!