My pregnancy was a bit unstable in the first 2--3 months so I did weekly check up to monitor the growth.
Baby’s heart beat was found at 5w6d as about 9x per min., my doctor told me that baby’s heart rate should reach 13x next week (7wk). At my week 7’s appointment it was measured at 13x. Week 8: 16x / Week 9: 18x / Week 10: 17x, etc. and my OB said these readings are all within normal range.
Bless you with my heart! Good luck!