Morning sickness is often present during the early stages of a pregnancy. Morning sickeness is a is very subjective symptom and can not be considered proof of a normal pregnancy. HCG levels in the blood are considered reliable parameters for evaluating the early stages of pregnancy. During a normal pregnancy , the level of HCG in the blood doubles every 2 days. If the HCG-level does not increase by at least 60% once every 2 days, there is a risk for miscarriage.


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