When did you find membrane — The Bump
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When did you find membrane

Long story short- I am just shy of 7 weeks with ID twins. Wondering at what point did others find they were having either di/di or mono/di as opposed to mo/mo. Nothing is visible yet, but the Peri says it's early. From the u/s pics I've seen online Di/Di seems pretty apparent. I'm very scared but he says we will know by 12 weeks. I am eager to know what others have experienced as this is all so new and overwhelming to me.

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Re: When did you find membrane

  • Di/di is almost always very obvious in 1st Tri, so based on your descriptions elsewhere I'd say it sounds like yours are mo/di or mo/mo.

    Mine are mo/di, but were not confirmed as such till just shy of 14wks at our third u/s. We thoughy we saw the membrane at an earlier one, but it wasn't clearly visible till later.
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  • I found out mine were di/di at my first u/s at 7 weeks. Was very obvious they were di/di at that point.
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  • Mine were mono-di-- we didn't see a membrane until 14w, I believe. It was super thin and hard to spot, but they found it.
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  • When I went for ultrasound at 8 weeks they looked like they shared sac, but when I went back at 12 weeks we saw the memberane so they are mono/di. It's very thin but you could still see it . Don't mono/mono is very rare and rate of having mono/mono is minimal . Goodluck on ur next ultrasound :)
  • It was really clear at my first u/s at 7w and change that they were di/di. They were each in their own "black hole". Even as they got bigger, it was always super obvious - techs would comment how easy it was to find. I think their placentas were even in completely different spots.
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  • I think I've also read on here that some ladies haven't seen a dividing membrane until 16+ wks. So there's time.
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  • We saw it at the first ultrasound at 6.5 weeks.  Ours was obvious but it sounds like others/ might not be as visible until later...  Keep us posted!

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  • We didn't find out until the 20 week ultrasound, which was a more high tech machine. Our twins weren't discovered until 17 weeks and the membrane is so thin it looked like mono/di. It wasn't until the level 2 ultrasound that it was clear it is di/di.
  • I found out at my first MFM appointment around 7 weeks. The membrane was very light, it was confirmed at my next appointment around 11 weeks.
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  • zamboni00zamboni00
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    My ob sent me to the MFM at 9w to determine type of twin. It was identified then.
  • My first ultrasound at 6 weeks just showed two in one sac. At 7.5 weeks at the MFM we found the membrane and confirmed they were mono di.

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  • Mine were mo/tri and while one of the membranes was easy enough to see, the one between A & C wasn't found until 22 weeks. Very nervewracking.

    However, if I'd known then that # of yolk sacs almost always corresponds to # of amniotic sacs, I wouldn't have worried so much. We saw all three yolk sacs at our 7w ultrasound.
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  • pea-kay said:

    Mine were mo/tri and while one of the membranes was easy enough to see, the one between A & C wasn't found until 22 weeks. Very nervewracking.

    However, if I'd known then that # of yolk sacs almost always corresponds to # of amniotic sacs, I wouldn't have worried so much. We saw all three yolk sacs at our 7w ultrasound.

    I am really hoping that probes true for me. Thank you everyone for responding. I never thought in a million years that this would be my life! So crazy. But that's probably another post:)

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  • We were told mono/di at our first ultrasound around 7 weeks so I'm guessing the RE saw it then but either didn't show us or we didn't pay attention because we were so surprised to see twins :). They look for it at all the MFM ultrasounds and it seems to be getting easier to see for me anyway. Got a good look today at almost 25 weeks for a few seconds until A decided to kick B.
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