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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.
How early can an ultrasound detect a heartbeat? I am 25, and seven weeks pregnant with my first child. I just yesterday got an ultrasound, and no heartbeat was detected. Shouldn't there be a detectable heartbeat by now? This has me worried sick. The doctor said I should come back in a week for another ultrasound. What should I expect?