Amenorrhoea for approximately 2 months.
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Fetus A and Fetus B share the same gestational sac, with no intervening membrane visualised. However two separate yolk sacs are present, and this is highly suggestive of a monochorionic diamniotic gestation.
Fetus C is in a separate gestational sac, and is hence the dichorionic diamniotic sibling of Fetuses A and B.
Gestational age 6 weeks and 1 day.