Took plan b pill 4days later after pull out method. also i was fertile at the time of the pull out method so can i be pregnant with precum?

You could be: Plan b is designed to be used within 72 hours of intercourse (not 4 days). Pre-ejaculate can cause pregnancy (but is less likely then with ejaculate because of a lower sperm concentration).

Yes: If a couple uses withdrawal method for birth control, over course of a year using this method, 30% will become pregnant. Thus, the odds are in your favor. Having said that, taking Plan B 4 days after exposure, only helped decrease chances by a little bit. Thus to answer your question, yes, you can become pregnant, but the odds are not in your favor to become pregnant. Good luck!