Do you realize that impregnation from rape occurs at the time of the rape, not later? So there's nothing you can do after the rape to prevent impregnation from the rape which already occurred. If you intend to prevent rapes from resulting in impregnation, you must arrange for that in advance. You must identify either the rapist or the victim in advance, and apply pregnancy preventive measures on them before the rape occurs. Why would you do that, and not try to prevent the rape?
Of course I realize you didn't really mean what you said. I'm sure what you really want is to terminate [abort] the pregnancy once it has begun.
“Do you realize that impregnation from rape occurs at the time of the rape, not later?”
Do you realize that it takes two to three days for sperm to reach egg?