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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.rogesterone. Progesterone levels also can have quite a variance at this stage of pregnancy. They can range from 9-47ng/ml in the first trimester, with an average of 12-20ng/ml in the first 5-6 weeks of pregnancy.
A transvaginal ultrasound (an internal ultrasound) can detect a heartbeat around 6 weeks of pregnancy. However, it isnât uncommon to be unable to detect a heartbeat via ultrasound until closer to 7 or 8 weeks. Find out more about week 6 of pregnancy in our informative pregnancy week by week series. Youâre More Likely To See A Heartbeat By 7-8 Weeks. Ultrasound machines can vary in technology.