I Hope Not!: Twins at 7 weeks should be fairly clearly visible on a transvaginal sono. As far as whether or not they might be identical, that is a more difficult question to answer by sono and requires careful analysis of the membranes surrounding fetuses, unless there is a single sac which would only be seen in an identical twins (rare). They can also be in 2 sacs however.
Answered 11/18/2013
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