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Rating Newest Oldest. Best Answer: Generally from 6 Â½ -7 weeks is the time when a heartbeat can be detected and viability can be assessed. A normal heartbeat at 6-7 weeks would be 90-110 beats per minute.The presence of an embryonic heartbeat is an assuring sign of the health of the pregnancy.Once a heartbeat is detected, the chance of the pregnancy continuing ranges from 70-90% dependent on what type of ultrasound is used.ating Newest Oldest. Best Answer: Generally from 6 Â½ -7 weeks is the time when a heartbeat can be detected and viability can be assessed. A normal heartbeat at 6-7 weeks would be 90-110 beats per minute.
The earliest is 5weeks when the baby's heart starts beating, while latest it has to be 8weeks. If its not present then there is some underlying pathology. Fetal heart beats range from 155 to 195.