體內

但是，雖說是安全期，但好像也不代表體內射精不會懷孕。

dànshì suīshuō shì ānquánqī dàn hǎoxiàng yě bú dàibiǎo tǐnèi shèjīng búhuì huáiyùn

However, it seems that just because it's a 'low risk day' doesn't mean that you won't get pregnant from intravaginal ejaculation.