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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.
By this point in the pregnancy, everything that is present in an adult human is present in the developing embryo. The embryo has reached the end of the embryonic stage and now enters the fetal stage. A strong fetal heartbeat should be detectable by ultrasound, with a heartbeat of 140-170 bpm by the 9th week.If a strong heartbeat is not detected at this point, another ultrasound scan may be done to verify the viability of the fetus.y this point in the pregnancy, everything that is present in an adult human is present in the developing embryo. The embryo has reached the end of the embryonic stage and now enters the fetal stage. A strong fetal heartbeat should be detectable by ultrasound, with a heartbeat of 140-170 bpm by the 9th week.