How does Emergency Contraception--including Plan B--work?

Ema explains over at The Well-Timed Period. Which by the way is, imho, one of the very best, if not THE best, expert blogs going: informative, well-written, focused, aware of the larger implications of its subject (she doesn't shy away from politics, but politics isn't the main point--information is). If and when I get around to send her my address so she can send me a copy of her book, I'll review it; I would expect it to be excellent, given the quality of her blog. Here's a link, if you're interested, or you can buy it directy from her site.

Anyway, the point here is that I was wrong. Plan B does not work by preventing implantation. It works by preventing or blocking ovulation. Just like the regular pill. The deal is that you take it on an "emergency" basis b/c, if you have unprotected sex (or are raped) during the time around ovulation, you need to take it asap in order to prevent ovulation if it hasn't already occurred. Read her whole post for much better detail. Bookmark it for linking purposes the next time you get into an argument with someone about whether or not pharmacists (or the FDA) should prevent women from getting it.