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Medical science has established conclusively that women cannot internally block an unwanted union of egg and sperm, no matter the relationship between male and female.
I think even schoolchildren understand that.

Akin and his Luddite supporters will dispute that.

It takes more than just fertilization to cause pregnancy. It also takes implantation.

Around 50% of fertilized ova never implant. Of those that do implant, 50% to 75% do not survive long enough for the woman to suspect she was ever pregnant. That means that only 13% to 25% of fertilization events result in diagnosed pregnancy.

Given that rape causes physical injury and emotional stress, both creating conditions less than ideal for pregnancy to occur, there is every reason to believe that pregnancy from rape is less likely to occur than from consensual encounters. I was taught in high school back in the 1970s that it's rare for women to become pregnant from rape.