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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.
In most cases, hCG levels will have a 25mIU/ml level (enough to be detected in the blood) 4 â 5 days after implantation. This is before your expected period. But in the urine, it will take 6 â 7 days before hCG levels reach 25mIU/ml. If you believe implantation has occurred, itâs best to wait a few additional days before taking a pregnancy test.