Hi, I posted on here way back when we were all just getting BFPs. Then I decided to hold off on the excitement till the 12w scan, I had a bad feeling. The scan didn't go well (I have a thread somewhere on Antenatal Tests and Choices if anybody's really interested in the details) but slowly the chances are improving. I've lurked from time to time but didn't want to post till we know for sure it's viable (next scan Thurs, another fetal cardiac scan in 2 weeks).
However, I just saw SantaLucia's post. I have seen other women with this (am also on FertilityFriend, thanks mostly to three miscarriages and desperately TTC, seen several instances on there). You're almost 20w. 24w is viability threshold. I have seen women whose fluid level got so low that their obs took action - but it was to try to keep them hanging on till 24w or as much past as possible, and then do c/s and NICU. I know that bit is frightening, BUT the conversation is NOT necessarily a termination.
Oddly, one piece of advice which seems to be common in the US and not in the UK (here they say it has no effect) is bedrest and drink plenty of fluids and eat high-protein diet. I know several women who tried that and the fluid levels increased, even normalised. Theoretically I can see why the UK docs say it doesn't work (water doesn't go straight from your mouth to the amniotic sac, and if there's a problem with the kidneys, there's a problem with the kidneys) BUT if you're dehydrated, the fluid levels DO go down - baby gets dehydrated too. (In fact, my mother just told me about the DD of a family friend also expecting in Feb - just went to MW b/c couldn't feel movement, was told to go home and drink plenty of water, next day the movement started). If you're feeling hopeless, at least drinking water won't hurt, may help and is at least something you can try.
The technical term is "oligohydramnios". And my own DD had it. Not till later, admittedly, but we don't know when - all we know is that at 15 days overdue(!) we had our first scan since 18w, and there was