I'm 28w with baby no 2, at 20w scan a white spot showed up on baby's bowel (I believe the medical term is echogenic bowel). They thought it might just be a calcium spot but booked a scan for today just in case. I went back today to see if it's still there and it is 
They have no idea what it is or the severity, I'm going next week to a specialist fetal medicine unit a few hours away.
The first thing they look for is potential genetic/chromosomal issues such as Down's Syndrome but my screening for that came back 1 in 49,750 so whilst they can't completely rule it out it's highly unlikely.
Baby is otherwise perfect and growing well, almost in the 'too big' range.
So just wanted to ask if anyone had similar on their ultrasound and what the outcome was? I'm so worried!