Please pray for my brother and sil

So my sil is 14 wks preggo and had bleeding and fluid gush on Saturday, so at their u/s today they saw the baby was fine and healthy but there's no fluid around him... Her sack/water broke and if it doesn't re-seal, her baby won't make it. They have her 15% that it will re-seal, I guess they see this happen in their office once a year and there's no direct reason... I feel awful bc we were so pumped about being pregnant together... She's one of the only few people that know, and now I'm not sure when and how to announce to my family bc I don't want to be insensitive. Just please pray for their baby, they sent me a pic of the u/s and the baby is perfect and beautiful, I just can't imagine.