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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.
The increase in serum hCG can be interactively monitored. 1  Below an hCG level of 1,200 mIU/ml the hCG usually doubles every 48-72 hours, though a rise of 50-60% is still considered normal and determines how early can pregnancy be detected. 2  Between 1,200 and 6,000 mIU/ml serum the hCG usually takes 72-96 hours to double.