Now, I know you're going to take what I say next as an affirmation that you're doing the right thing (people who would take days out of their lives to yell at people they do not know usually have a pretty solid persecution complex going already), but here goes, anyway:
If what you're referring to is standing out in front of an abortion clinic trying to talk people out of having abortions, that's not "counseling." That's harassment. Think it's not? Do you raise your voice at people who did not ask for your input? Does your group ever say things like, "Please don't kill your baby"?
I know you'll continue doing it no matter what I say, but what you're doing is immoral, unethical, and pretty horrible. You're preying on emotional, stressed, anxiety-ridden people about to undergo a surgical procedure. Even if half of the people you talk to do decide against abortion (a figure I seriously doubt), you can chalk that up not to the power or righteousness or your argument but to the strength of emotional harassment and manipulation.
Scaring people out of making a decision for themselves is just about as low as a person can get on the ol' ethics totem pole, as far as I'm concerned. Why can't abortion protesters just go plant their own darn cabbages and let people live?