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Twins Come Early. Another difference between a twin pregnancy and a singleton pregnancy is that the babies tend to arrive very early. Full term for a singleton pregnancy is 40 weeks. If you carry twins to 40 weeks, bless you. It is not an easy task. Most twins never make it that far. Most twins arrive around 36 weeks.
In a normally developing singleton pregnancy, quantitative serum HCG levels double every 2-3 days during the earliest weeks of pregnancy. This HCG calculator can be used to determine the doubling time of your HCG levels.