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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.
A blighted ovum, also called an anembryonic pregnancy or anembryonic gestation, occurs when the early embryo stops developing, is resorbed and leaves an empty gestational sac. The reason this occurs is often unknown, but it may be due to chromosomal abnormalities in the fertilized egg. A blighted ovum usually occurs early in pregnancy â between about week 8 and week 13 â sometimes before you even know you're pregnant.