Hi Gangle,
We went through a similar experience, although unfortunately somewhere with less sensible sonographers and consultants than you seem to have had.
At our 12 week scan (when from my openly sketchy dates they had me at 13+4 weeks) the sonographer diagnosed both an exomphalos and 'significant' nuchal thickening. We were referred to a consultant who said the combination made it seem likely that our baby had a condition called Edwards syndrome, which has a 'not compatible with life' prognosis and who offered us a termination on the spot...
Bear with me... it gets better, honest!
Unsurprising we requested a second opinion before even considering such a drastic step, and were referred to the fetal medicine unit a different hospital 3 days later (worst 3 days of my life, so I know what you're feeling...)
First thing they did was take measurements to accurately date the baby (which you'd imagine would be done at the 12 week 'dating' scan I'd just had, but no...) and from those measurements and further quizzing as to my cycle length decided that I was, in fact only 11+6 weeks.
The dating, he said, was especially pertinent, since at 11+6 what he termed an 'umbilical hernia' was nothing unusual, since babies begin to develop some of their organs in the base of the umbilical cord, and they gradually work their way in. However, if they hadn't checked my dates and assumed I was nearly 14 weeks, then yes, that wold possibly have been cause for concern. He also said that he 'couldn't see' a significant herniation at this point, and the problems may well have fixed itself.
However, our nuchal thickening was still a cause for concern, (the measurements gave us Downs risk of 1:50) so he recommended a CVS (like an amnio, except they take placental tissue rather than fluid, and they can do it a lot earlier). He cautioned us that it did have a risk of miscarriage, but after what we'd been through for the previous few days, we needed to KNOW what we were dealing with for the sake of our sanity.
The procedure was absolutely fine, and we got the results within a week for the 3 'big' chromosomal abnormalities (downs, edwards and pataus) and a whole lot more after 2 weeks, all of which came back normal.
They had us back again at 15 weeks to 'double check' the exomphalos and again, all was fine. I'm expecting an apparently healthy and very wriggly baby girl in 4 weeks...
In short, the first hospital scared us silly, but, had they explained the situatio properly, as yours seem to have done, and our subsequent consultant did (LOVE you, Homerton FMU xxx) they could have saved us a lot of anxiety...
Try not to worry... I know it's hard, but as they siad, it's an issue which often resolves itself in time, as just a part of normal fetal development. You can also be reassured that they didn't pick up any other 'soft' markers for genetic problems (such as an increased nuchal fold measurement as in our case) - all this is good. It's also worth bearing in mind how rare this condition is - the odds that all is fine are overwhelmingly in your favour.
Even if it it still there later on, it's a problem which has a huge range of severity, and is eminently fixable even at its most extreme. I found this website ? www.geeps.co.uk - a support site for families of children with this condition, extremely helpful... the children here are beautiful, and most have come through the experience just fine - the only long-lasting reminder being a 'unique' belly button! Have a look at the 'experiences' section.
Really hope all turns out well for you too... It's a terribly anxious time, and I feel for you... Keep positive and take care of yourself in the meantime...
... and let us know how you get on at your next scan?
BIG HUG
DB
xx