If my girlfriend took plan b can i cum inside her without her getting pregnant?
No — emergency contraception (aka the morning-after pill) can help prevent pregnancy after unprotected sex, not before. The morning-after pill can help prevent pregnancy when taken within five days after unprotected sex. It does not prevent pregnancy for any unprotected sex you have after taking it. If your girlfriend takes the morning-after pill and then you have unprotected sex, she’ll need to take emergency contraception again.