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There is no way to know what action plan B may take in a particular woman, and for pro-lifers to compare it to abortion really screws over their cause.

I appreciate what you're saying and, on one level can appreciate it.

I've posted before (from the drug maker's website) that the 'plan b' drug has three mechanisms of action:

it can prevent ovulation from happening in the first place
it can change the viscosity of the mucous membranes, making fertilization more difficult
it can prevent the fertilized egg from implanting on the uterine wall

For me, personally, the potential of the third mechanism happening is what makes me opposed to the drug. That third mechanism makes it an abortifacient. (FWIW, I am equally opposed to any hormonal birth control and to the IUD for the same rationale). For those who believe that life begins at the moment of fertilization, the intentional termination of life is abhorent, whether that life be one minute after fertilization or 388,000 minutes after fertilization.

If it wasn't for that third action, I would, as a practicing Catholic, still be opposed to the drug, but the opposition would not be nearly as vehement...as the actions that the person using the drug would be impacting herself and not impacting a third party w/o any say in the matter (i.e., the blastocyst, which in 380k +/- minutes, emerges through the birth canal as an infant).

Perhaps the above will help you recognize that we all aren't a bunch of wild-eyed loons...but just trying to be consistent in our pro-life views.

I understand the 3 mechanisms and why the 3rd one is against your beliefs. But there is also the fact that women can't get pregnant except for a small time in their cycle, so most women taking plan B would probably not get pregnant anyway. There is also the fact that less than 50% of embryos implant even if the uterus is prefect.
So there are actually about 5 mechanisms before you get to the "true abortifacient" action. In my view, I don't think it's an abortion anyway, but the chance is truly quite small.
Catholics (and others) have to do what they have to do...but nobody is going to reduce abortion if you're against birth control. People have sex and always will. Most families can't have 6 kids and most women can't use natural family planning.
I just wonder, is it better to be perfectly consistent, or to reduce abortion of known fetuses by the use of birth control, even if there might be small, unknown loss of some embryos? I know where I stand.