there is a problem with this argument, and i believe it's the one that the right wingnuts have the biggest beef with. what if the egg has already been released? fertilization can take place up to 24 or 36 (depending on your source) after ovulation and can happen in as little as two hours after unprotected sex. so, someone has sex, ovulates (and some theorize that sex can trigger ovulation to a limited extent), fertilization takes place, then the next morning someone takes plan b. plan b then possibly prevents implantation of the zygote (according to their own web site). for the "life begins at conception" people it is morally wrong to prevent implantation of a fertilized zygote. the fact that this happens naturally is irrelevent to them. if god takes care of it, then it's his choice, but when people interfere then that is Bad(tm).

i'm not saying i agree with them, but they do have a point that is not mentioned by the above. to be consistent with the theory that life begins at conception and doing anything to prevent that life is wrong, then opposing plan b is the logical view.