Well, sort of similar experience... just that in the middle of my pregnancy they started getting me all worked up about things they were seeing, and I through it all I tried not to get to stressed about all the unknown.
1st it was "mild pyelectis", a little fluid in one of the lungs and the 20 week ultrasound. This is apparently fairly common in boys and also usually works itself out. Oh but it is also a marker that triples your chances of downs syndrome.
Went back for another US: and kidneys were all good, no issues there now. The fluid worked back down to normal levels. Oh but did anyone notice this measurement in the brain that is a tiny bit bigger than it should be? Yikes, no.
Went to a specialist for that: Wow brain looks great, perfect. except for that one little weird measurement that probably means nothing. Or at least definitely doesn't mean X,Y, and Z bad thing it could have meant. How about an MRI just to be sure?
Had MRI. Pediatric Neurologist looked at it: Yep, it's probably nothing. Or maybe a cyst. Which still isn't apparently a big deal. We'll probably check it out awhile after the baby is born with another MRI, but your baby should be fine.
Ay ay ay. It's like I wish they would just stop looking so closely at things.
Through it all I also felt pretty confident nothing was too off with my baby. Just that gut feeling. I don't deliver for a couple more weeks though so I guess I'll find out! I never did get any extra testing to determine downs or anything. I guess my feelings were it was not worth it to get worked up about anything "unchangeable". And that here we were nitpicking a few tiny things when there are in reality a million things that can go wrong with a human being. Like, my current kids could still develop any odd kind of health problem or malady. Parenting = worrying and constantly praying your kids stay as healthy and safe as possible. So, it being my 3rd time, all the ultrasound drama just felt like more of the same parenting worry I've already had over my kids, just starting even early.
I have no idea if this is helpful to you, just sharing my story and my own response to what Dr's were telling me. In fact I probably answered your previous question too, so sorry if this is repeat. And technically I don't know the answer to how mine turned out yet! But he certainly feels strong and healthy in there. Keep us updated on your pregnancy :)