i know how you feel , well not really I have never been pregnant with triplets, but i too was worried about my waters breaking. I remeber with my first i was already in hospital with pre eclampsia and i woke up at night busting to go to the toilet and my waters broke while i was sitting on my bed.. I had to get the midwife to check i hadnt wet myself. My second my waters were broken for me and my third my waters broke at home. With my third it was just in bouts of leaking and i wasnt sure if i was just wetting myself .

AS for your sharp pains it could be your muscles starting to get ready for labour, everything is soft and ready to move around and the pressure the bubs are putting on your pelvis etc might be part of the reason, but as always if you are worried call the hospital or midwife. Maybe just give them a call and explain what you are feeling so they can give you some reassurance