Twins Possibly In Same Sac

Lindsayh22 · July 2013

At my first ultrasound at 7 weeks I found out I was having twins. After my doctor reviewed those scans she said it looks like the twins are in the same sac. I have to go to a specialist now to get another ultrasound to determine if that is the case. I am absolutely terrified. I have read so many scary things about MoMo twins. Has anyone had the experience of thinking their twins were in the same sac but later finding out that they were not? Does anyone have MoMo twins that are healthy? Very, very scared.

PurpleIris30 · July 2013

I wouldn't worry at all yet. My regular OB didn't expect to be able to even find a dividing membrane at only 7 weeks. I had regular ultrasounds at 7,8, and 9 weeks, and they couldn't see a dividing membrane indicating two amniotic sacs. We went to see a MFM specialist at a little shy of 10 weeks. He had incredibly detailed ultrasound equipment, and we were able to see the dividing membrane with his ultrasound. I believe I've read the optimal time to be able to see the dividing membrane is between 10-12 weeks. I'll see if I can find that source.

Do you know if the babies had two yolk sacs or one? If two yolk sacs, that is a good indication -- although not 100% -- of two amniotic sacs.

PurpleIris30 · July 2013

Also, are you sure at only 7 weeks that when your doctor used the term "sac" he was referring to amniotic sacs rather than gestational sacs? At 7 weeks, they are usually just confirming heartbeats and seeing if the babies are in one or two gestational sacs.

pea-kay · July 2013

If he meant same amniotic sac, it's way too early to worry about that. If he meant gestational sac, that's fine. That's normal for mo/di moms.

This might help:

https://pyjammy.com/types-of-twinstriplets/

jezebel57 · July 2013

My 7w3d u/s from the RE they said they were Mo/mo. My OB u/s at 8w1d showed clearly 2 amniotic sacs making me mo/di. I think it's too early for you and mo/mo are extremely rare, so they odds for mo/di are in your favor!

Mrs. Alice · July 2013

Ditto the others. 7 weeks is way too early to diagnose twins as momo. My first u/s was at almost 11 weeks and we could barely see a membrane at that point. They were however clearly in the same gestational sac (same big black hole) making them mo/di. If you scroll down a little ways you will see a post about a mom who was just confirmed mo/mo at 14 weeks. Best wishes to you, and try not to freak yourself out about it!

ballygirl · July 2013

Don't be worried yet, they often will show up later. I was told the same thing at my 7w u/s but it showed up a few weeks later. They can be really hard to see, even for the ultrasound techs. They found mine at I think a 10w u/s but the u/s tech really spent a looooong time looking for it. Later on it became a bit more visible.

SWA80 · July 2013

Even at my 11 and 13 week scans, the membrane was very hard to see. At my scan last week, tech commented that the membrane is very thick. Try not to worry too much just yet but it is good that you'll get to go ahead and see a MFM.

daisy19782011 · July 2013

I wouldn't worry until you go to the specialist. Their machines are very clear and it is still early. I am almost + at this point my twins are mo/mo, but they will check again next week. You can worry with me All we can do it take it one day at a time!

I hope you find that membrane I am still hoping I have one in there too!

MuseumMaven · July 2013

Like PP have said, it's way too early to diagnose mo/mo twins. I originally thought that my guys were mo/mo but we found the membrane around 11 weeks. They were fine and are currently running around the family room like crazy. Try not to worry chances are good that they'll find a membrane.

24karat · July 2013

We had early u/s at weeks 6, 10, and 12 and it took till that last one (with a specialist) to find out our twins are mo/di instead of mo/mo. My dr said from the beginning that the twins looked like they were in the same sac, but that they would keep an eye out for that tricky membrane and it was eventually seen quite clearly.

It's scary reading all the stuff about what could happen with twins (whether TTTS, mo/mo, PTL, etc) and one the best things you can do for yourself right now is to try to relax. If that means not reading all the web articles and books that list the scary stuff, definitely minimize your exposure to those so you can reduce the stress on your mind. Mo/mo's are quite rare and even if they are mo/mo, that doesn't automatically mean they won't be healthy.

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