Precum got on girlfriend do vagina during possible ovulation. plan b was taken 12 hours later. should we be worried?

Plan B: plan B isn't 100% effective, so check a pregnancy test 2 weeks after this happened. Precum has about 20 million sperm per drop, so a condom is always a good idea and using some form of birth control regularly is also a good idea.

Pregnancy: Plan B One-Step can reduce your risk of pregnancy by up to 95% is used within 24 hours of sex. It is VERY important to use protection 100% of the time if you & your partner are not ready for a pregnancy.