I'm a regular poster on the IF board. I have a question that I thought maybe moms of multiples could help me with.
Just completed my first IVF. Had my first ultrasound today (5 weeks, 3 days). Very early to tell much, but the doctor said we have one sac with two yolks inside.
He said that it looks like the embryo split (we did ICSI and assisted hatching). He is having me come back in one week to see if fetal poles develop. He also mentioned that if 2 fetal poles develop, the next hurdle is to make sure they have a membrane separating the two or else it could be a very high risk pregnancy.
MH and I are in shock about the possibility of identical twins. And concerned about the risk of losing one or both and also of not forming a membrane.
I'm curious if anyone started out the same way? Any advice is greatly appreciated. Maybe I'll be joining this board some day!
Thanks and congrats to all of you.

Re: One Sac and Two Yolks at 5 weeks!?
I never had IVF but there is a chance that you could end up with mono/mono or mono/di twins. mono/mono is the higher of the two because the twins would share a sac and a placenta. If they are mono/di then they would only be sharing a placenta and have their own sac. Of course this early on you could loose one due to Disappearing Twin Syndrome but lets not think of that. Try ( yea i know .. ya right) to relax and take it easy. Shock is VERY normal. When I found out we were going to have twins at 7 weeks I could have fallen off of the table.
Good luck!
edited for incorrectness!
I wouldn't stress out about the membrane just yet. Lots of mamas with mono/di pregnancies who have early u/s aren't able to see the dividing membrane until the 2nd trimester. The membrane is always there but since it's so thin, sometimes it can be hard to see on u/s. Like PP said, mo/mo twins are very rare. It definitely takes some time to sink in. Good luck!
Peanut Butter and Jelly!
<a href="http://s568.photobucket.com/albums/ss122/AliceNP/?action=view
IVF 1 April 2011 - Cancelled
IVF 1.5 July 2011 - MC
IVF 2 October 2011 - BFP!
*Identical Twin Boys born June 2012*
Here we go again...IVF 3 is underway!
Can't tell you how much I appreciate the advice and encouragement. What a journey this has been, and it's just the beginning!
Thank you
Me:34 PCOS, one kinked tube, low thyroid.
DH:39 lower than average count.
Married 2006. 3 failed IUIs and countless BFNs.
~IVF#1: July 2012~
7/10 Retrieval: 16r, 14f w/ICSI. 7/15 ET: Transfered 2. 4 frosties.< Poas faint+ 4dp5dt.>
Beta#1 (8dp5dt): 138. Beta#2 (10dp5dt): 355.
u/s#1: (19dp5dt) 8/3/12 one sac, two yolks! Beta 8,000
u/s#2: two strong heartbeats! EDD 4/2/12
Boy/girl fraternal mono/di twins-- lost our sweet baby girl at 22 weeks due to SIUGR
Preterm labor at 23 weeks 4 days, lost our sweet baby boy.