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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.
Serum pregnancy tests measure human chorionic gonadotropin (hCG) which is produced by placental syncytiotrophoblasts following implantation. hCG is composed of 2 subunits: alpha and beta. The hCG, Total, Quantitative test (test code 8396[X]) detects intact hCG molecules and free beta-subunits of the hCG molecule. The serum hCG test can be positive as early as 7-10 days following conception. However, in some pregnant women, the test is not positive 7-10 days after conception. This is because the time to implantation (and production of hCG) can be longer in some women. So a negative result does not rule out pregnancy, and repeat testing may be indicated. Question 3.