me too...i need to 抽胎水 due to Oscar high risk. I bled after 抽胎水 and rested at the hospital for one week. For me it is just a rare case coz i got twins, i 抽胎水 twice plus my one of the placenta is located too low. Anyway, just to let you know i saw many 抽胎水or絨毛 cases on BK site and they are all fine.
it's very common now. get a good Dr should be no prob..