11weeks ultrasound what is the white thing next to baby that looks like a mirror image?

mom of 3

New member
http://www.whattoexpect.com/baby-pictures/PhotoDetails.aspx?photo=8320eac1-2514-4fc6-b3ee-e4b220b92a44
This is my 5th preg. and I just haven't seen anything like it in any of my other U/S and I looked on google and didn't see anything like it there. My OB is the one that did this U/S.
 
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