Hi, I am nearly 38 weeks and beginning to think that I ought to have something protecting my mattress just in case my waters go at night. But I really don't want to fork out on a special cover (they seem v expensive...esp as we have a king size bed). DH thinks that when PG with DD I just put a bin liner under the sheet- I can't remember doing this, but it sounds a) a bit sticky and yucky and b) unlikely to be effective.
Anyone got any good tips for cheap mattress protection?