I had an ultrasound at 8wks 2days gestation. The EHR (embryonic heart rate) was recorded at 141bpm, everything I have read suggests the heart rate should be higher somewhere in the 160 - 170's (although I am aware that internet search engines can be your worst enemy at times). The embryo measured at 19mm which correlates with my last LMP and Ovulation dates, as I tracked my cycle.
The sonographers report stated that it was a normal intrauterine pregnancy at 8wks 2 days. My Ob also gave me a quick ultrasound at 9wks to the day and the Embryo had grown to 25mm, which is still perfect for dates, however she did not measure the heart rate as the ultrasound was for my "piece of mind" as I had a full term stillbirth this time last year. (I have Heterozygous Factor V Leiden & Homozygous MTHFR C677T). I am on BA, 80mg LMWH, 5mg Folic acid, Prenatal Vitamins & 1200mg Calcium with vitamin D. PHEW!
Dr. Keith I am just looking for confirmation that a heart rate of 141bpm is within normal range for an 8wk gestation.