Not quite the same but i have had 4 scary pregnancies.
First mmc. Second everything looked great then we got a huge shock at the 20 week scan. Third everything looked great then a follow up scan to get the nt measurment at 14wks showed hb had stopped and baby had triploidy. A little similar to edwards and pataus which i think are incompatible with life.
This current pregnancy i had screening and they couldnt give me a risk for downs as my hcg was too high so it has been a worry.
I habe kept myself sane thinkimg things like even if it is a 1:2 risk you could still be the 2. A 1:78 risk isnt horrendous. Ypu could be anyone of the 77 out of that stat.
I realise its very stressful waiting for the results however you have done exactly what i would have goinf for the nipt which is none invasive and will more than likely give you a much lower risk.
Fwiw my third pregnancy, the triploidy one,was after my second pregnancy, my son,being stillborn. When i found out the pregnancy ended because there was something seriously wrong with the baby which meant it would have died regardless i was just glad it had happened at 14wks rather than later on and found it much easier to come to terms with.
I honestly think though that the nipt will produce a much lower risk and its nothing to worry about too much at the moment. I just wanted to cover all aspects with the history i have. Will keep everything crossed for you.