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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.
This particular pregnancy test can detect hCG levels as low as 6.5 mIU/ml. What makes this test so accurate is the fact that it is so sensitive. Most at-home pregnancy tests are designed to detect hCG levels around 20 to 25 mIU/ml. Any woman with an hCG level over 5 mIU/ml is considered pregnant. However, despite the fact that the First Response pregnancy test can detect a pregnancy almost a week early does not mean that it works for every woman who is pregnant. Not all women have enough hCG in their urine six days before their missed period.