HCG Calculator Level Tool

The HCG calculator pregnancy doubling level tool interactively calculates whether your blood hCG levels increase normally during the first few weeks after implantation.  HcG or human chorionic gonadotropin is a hormone produced by the placenta shortly after implantation. The hCG hormone will begin to rise and should increase normally every 48-72 hours for the next several weeks. In a normal pregnancy it increases by at least 60% every 2 days.

Doctors will often use the quantitative blood test if they are closely monitoring the development of a pregnancy.
For more information on the hCG hormone please read HERE.