Are crisis pregnancy centers deceptive? Is that OK?

The Baltimore City Council is requiring crisis pregnancy centers to put up signs making clear that they do not provide abortions or birth control.  I do not support such a mandate from the government, but I do wonder, should crisis pregnancy centers be making the nature of their services clear on their own, or is deception part of their mission in that it gives them the best chance to gain a hearing for their pro-life message?  Should deception be a legitimate part of the pro-life cause?