Precum can have small amounts of sperm in it, but the chances of getting pregnant from it gets higher if you continue to have sex after the man has already came once, and didn't urinate immediately afterward. If he doesn't use the bathroom any sperm that was still umm, in there, can be brought out with precum during the second round of BD.
As for the pull out method, my SO and I have used that method for 5 years without incident, I only got pregnant this time because he was too drunk and forgot to pull out in time even though I told him I was ovulating and to be careful. So, it can work, but you have to be careful doing it, because just being one second too late can get you pregnant if the timing of your cycle is right.