Hello, I would be happy to help you with your question.
From what you are saying, it sounds like what they thought was a band is actually a partial separation of the "membranes" or sac from the wall of the uterus
. This is also called a placental abruption
. If this is the case, it is not a threat to the baby like an amniotic band might be.
Assuming that they are reassured that it is not an amniotic band, and they have shown the baby to growing normally, AND you are noticing no bleeding, pain, and normal fetal movement
in an otherwise uncomplicated pregnancy
- then you probably have little to worry about at this moment.
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