Isn't plan b 95% effective?? This is saying differently

Question

Answer

What I read says this about it "If you take it within 72 hours after you've had unprotected sex, levonorgestrel can reduce the risk of pregnancy by up to 89%. If you take Plan BOne-Step within 24 hours, it is about 95% effective. But you should know that Plan B One-Step is not as effective as regular contraception". So maybe they're talking about the average percentage since this just says "up to" which is another way of saying "in the best case scenario"

Answer

Plan b stops ovulation. So if you’re already ovulating and you take it, it won’t stop a pregnancy.

Isn't plan b 95% effective?? This is saying differently

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