CH merged into the nuchal fold by the second scan (which is why it grew so much and we thought it could be beginning of hydrops). Then - it disappeared. Nuchal fold measurement was down to 5mm, just 0.8mm higher than 3 weeks before and less than the expected increase in that timeframe, and no sign of the CH. It's weird.
We're told that once seen, the increased risk from CH remains, even after the CH has resolved - but obviously the risk of hydrops (whilst still an omnipresent threat) decreases with the decreased fluid levels.
The cardioscan at 15w was totally normal for dates (seems I have more heart issues than the baby right now, I have a hole in the heart, a heart murmur and tachycardia! Hey, if I'm taking the hit, I can deal with that, I feel fine and can still run for a bus whilst carrying my 2yo so it can't be too serious). We do have to go back at 22w. We're aware that a more detailed later cardioscan could reveal problems - but they're very unlikely to be "catastrophic".
Basically, the main threats at the moment are: hydrops, just because there has been a hygroma; unknown rare chromosomal disorder; Noonan's Syndrome (which is pretty much undetectable till after birth, as far as I can see - no indications of it other than the high nuchal and the apparently-resolved hygroma but it can't be ruled out); 'minor' physical abnormalities ('minor' being probably non-fatal, though still potentially serious and requiring surgery, etc).
At the moment we don't have a definite date for final results but it's very likely to be this week - 7-10 days from amnio last Weds. I was told that they would expect to let me know by Fri, but it could potentially be Mon.
I've got another fetal medicine appt/scan in a couple of weeks' time, but have appts with the anaesthetist and high-risk ob (re birth plan/my care) in the meantime. Still considering asking for a home birth just for the reaction
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Right now I think I'm just in "whatever..." mode. We were told with DD that she had a 30% chance of surviving to term and I've had three miscarriages too and was told by the recurrent miscarriage clinic I had a 75% chance of miscarrying any given future pregnancy, so I kind of feel like been there, done that, it's not a proper pregnancy unless you do the whole obligatory rollercoaster ride and the odds are stacked against you. I'm still feeling really detached; I guess it's the self-defence mechanism kicking in. Anyway, it's relatively easy to think about it quite objectively at the moment, and let the hospital get on with it. From experience, the emotion doesn't usually kick in till 2-3 weeks after the loss, and then again at the due date. Which, for the last miscarriage, is the day after tomorrow... With DD, I suppressed the fear throughout the pregnancy and delivery and then it all came out in nightmares and flashbacks about 6m after the birth - the nightmares are still ongoing, I wake at night crying and thinking I've lost her and have to go and check she's still breathing, but this baby still isn't featuring in the subconscious despite the fact I can feel it wriggling. It's so strange and illogical, the way the mind works. I guess sometimes you need the detachment to stop yourself just falling apart. I can't afford to break down so I won't.