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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.
Thus, 4-5 days after implantation (i.e. approximately before the due time of the expected period), the HCG content in the blood sample is about 25mIU/ml. It can be detected by an immunoassay (analysis of a blood serum, taken from a vein in special laboratories).e careful when choosing a test in a drugstore! If the package has a note, saying âsensitivity 20 mIU/mlâ, then the test is suitable for early detection of pregnancy (immediately after the delay). Tests, with a note âsensitivity 40 mIU/mlâ can be used no sooner than on the 7-9 day after implantation bleeding.