I had unprotected sex in a pool without ejectulating how likely is it for her to be pregnant?

Its possible: There is the "pre-ejaculate" that contains sperm. This is why the withdrawal method just isn't a reliable form of birth control. If this happened in the last 3-4 days, it still may not be too late for her to use emergency contraception. Plan b is one of the choices out there. The sooner she uses it, the better chance it will have of working.