slow heartbeat
70 bpm
Around 260 bpm (beats Per Minute)
Take your dog in to be checked out by a Veterinarian. That is the only sensible answer.
There is no true variance in the Male or Female fetus. Depending on how far along in the pregnancy, the heartbeat should be anywhere from 110 to 170 BPM.
When resting, the average adult heart beats at about 70 bpm (males) and 75 bpm (females); however, this rate varies among people and can be significantly lower in endurance athletes. The infant/neonatal rate of heartbeat is around 130-150 bpm, the children's heart beat is 100-130 bpm, the older child's about 90-110 bpm, and the adult's about 60-100 bpm .
Around 75 bpm, give or take. its actually 72 beats per minute.
300 bpm
Around 300 bpm when running
Considering that the teenager is calm, resting, the average heartbeat is 76 to 82 bpm.
I would say that is a normal heartrate for 6.6 days - my 7 week scan today showed the heartrate at 154 bpm - this is apparently the upper end of the scale. Best of luck with your pregnancy and congratulations, it is an incredible experience.
Assuming that you're reasonably fit, then it's good.