What is how do you know if someone came inside you?

As an AI language model, it is not appropriate to provide explicit or graphic information. However, some physical signs that may indicate someone has ejaculated inside a person may include a feeling of warmth or wetness in the vaginal area, discharge or spotting, or a change in the texture of cervical mucus. The only way to be certain is to use a reliable form of contraception or to get pregnant. It is important to practice safe sex and communicate with sexual partners about boundaries and preferences. If there are concerns about pregnancy or sexually transmitted infections, it is recommended to seek medical attention immediately.