Our expert says:
There is a small chance, but it is POSSIBLE. Sometimes sperm cells my remain in the tubes after a previous ejaculation and these could be transported into the vagina with the fluids prior to ejaculation(pre-cum). Coitus interrupus is not a reliable method of contraception. If this has happened, it may be worth considering emergency contraception (if within 72 hrs). Remember, condoms are not just about protecting against pregnancy, they also protect against STI's which can be transmitted by skin on skin contact or exchanging of fluids (including pre-cum). If you are certain that his sexual health is good, then you should be okay.
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