Dede,
Yes, using the Plan B pill for contraceptive purposes is a sin. This is because contraception ruptures the unitive and procreative aspects of sexual union, which cannot be deliberately separated without serious sin.
Also, research demonstrates that Plan B also causes early abortion, and abortion is the killing of a living growing innocent human being.
Whichever of the two mechanisms is active in a given cycle, using Plan B is a serious sin.
Paul
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