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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.
More sensitive tests, those that are able to detect a lower amount of hCG, can provide an accurate result as early as 7-10 days post ovulation. When deciding if you should use an HPT or have a blood pregnancy test done at the lab, here are a few items to consider: (See the chart below for average blood hCG levels as pregnancy advances). 2  If hCG levels do not rise appropriately in those very early days, it can signal a problem with the pregnancy. 3  By monitoring your exact hCG levels with regular quantitative blood test, your doctor may be able to detect a problem early on.