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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.
Pregnancy test sensitivity. Some home pregnancy tests are more sensitive than others. Some tests can detect pregnancy with HCG levels as low as 20 mIU and other tests require HCG levels of 100 mIU to detect pregnancy. A 20 mIU home pregnancy test may show a stronger line than a 100 mIU test. faint positive test result may occur if you read the pregnancy test after the manufacturer's recommended time. Some pregnancy tests will continue to react to urine and produce a false positve result if read after recommended time period.