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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.
Even then you would only hope to see a gestational sac. A fetal pole and heartbeat would not be seen until after 6 weeks. If you are concerned the best way to know for sure is to have your quantitative HCG levels tested over 48 hours. This will give you a baseline number to know how far along you are. And in a healthy pregnancy your level should double over 48 hours.