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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.
1 Blood hCG levels are not very helpful to test for the viability of the pregnancy if the hCG level are above 6,000 and/or after 6-7 weeks of the pregnancy. 2  Instead, to test the health of the pregnancy better, a sonogram should be done to confirm the presence of a fetal heart beat.