hi, i had oliohydromnious for my last 2 pregnancys and i got gestational diabetes this preg. with my last 2 i found out at my 20wk ultrasound i had no fluid at all, but i made it an extra 7wks or so, dont stress cos the more water and fluids u drink the more fluid the baby makes, the big drop in fluid just means that maybe some leaked u mite not have even noticed, i never did. it still nothing to worry about. i had a stitch put in at 18wks this pregnancy to hopefully keep baby in there full term and to try to prevent loss of fluid, all good so far, but i got diabetes now and have been on insulin for last wk, im due 25th march. hope all goes well.....