Twins are medically referred to as monozygotic (one egg which splits) or dizygotic (two eggs). Monozygotic twins are "identical"; dizygotic twins are "fraternal." The frequency of monozygotic twins is about 4 per 1,000 live births; dizygotic twins increase in frequency as women age, from 3-14 per 1,000 live births.

Two placentas indeed means dizygotic, or "fraternal" twins (a single placenta does not, however, mean that twins are identical).

Exercise is an important part of any pregnancy, but there are no special exercises for mothers of twins. Keep in mind that the uterus will rise out of the pelvis at 10-12 weeks, after which it is no longer protected by the bony structures; this means no "contact" sports after this time.

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