My gf took a plan b 2 months after it expired.i didn't ejaculate in her and i was protected. we are worried about the pre ejaculate. will it work?

Buy her another dose: Encourage her to be "safer" and consider taking another dose of the hormones in Plan B or to ask for a copper IUD which is another more effective "emergency postcoital contraceptive" and a better long lasting method of prevention of pregnancy . The multiple and very significant risks of an unplanned pregnancy outweigh the inconvenience, discomfort and potential side effects of any contraception.