My sister-in-law is pregnant with triplets - two of the triplets are identical (coming from the same fertilized egg) and the other triplet was from a separate egg. The ultrasound clearly shows that the baby from the single egg is ONE WEEK OLDER than the identical twins. The doctor has confirmed this and got a second opinion. It is possible to get pregnant once you are already pregnant - but I would imagine only for a certain amount of time. I'm not sure that you could get pregnant when you are three months pregnant.
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