Band or line through gestational sac

I had an ultrasound done at 6 weeks it looked like there were two sacs with one baby. They had me come in a week later to see what was going on. We saw one sac with a band going through it and one baby on the smaller half of the sac. Has anyone ever has this? and if so, did it compromise the pregnancy or harm the baby in anyway?
They say this can be caused by a previous c sections and is quite rear. Waiting to see a specialist but wanted some input before hand.
Thank you!

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