[MHGinTN]

Bob, once again your lack of education in these matters is showing ... or perhaps it's just your fun at agitating thus you mischaracterize for the 'irritation to others' you crave.

Contraceptive pills are designed to work by preventing the release of an ovum (until timed just right) via interruption in the leutinizing hormone cycle. Most also have a secondary (that means not the primary or main) effect to destabilize the uterine lining so that implantation fails or doesn't last when the menses is stimulated by withdrawal of the hormone 'extras'. The secondary effect is relevaent only in cycles where a conception might hvae occurred ... and that's why contraceptive pills aren't 100% effective, guy.

[XBob]

391 - WRONG - "Contraceptive pills are designed to work by preventing the release of an ovum (until timed just right) via interruption in the leutinizing hormone cycle. Most also have a secondary (that means not the primary or main) effect to destabilize the uterine lining so that implantation fails or doesn't last when the menses is stimulated by withdrawal of the hormone 'extras'. "

You need to add 'some' in front of your comment. There are numbers of types of contraceptaive pills/methods, and a number of them work only by causing an implant failure, and one (I forget which one), held the largest market share a number years back - I don't know the current status) .

[XBob]

PS - I looked this up a few years ago, and I am not going to do it again. The drug companies try very hard to cover it up, as they want to sell their pills to all the people on this thread, and it is very hard to find - it took me about 2 weeks before, when I finally found a lab report from a manufacturer, that they let slip through.

I think I may have posted it somewhere on FR a few years back.

[XBob]

PS - I looked this up a few years ago, and I am not going to do it again. The drug companies try very hard to cover it up, as they want to sell their pills to all the people on this thread, and it is very hard to find - it took me about 2 weeks before, when I finally found a lab report from a manufacturer, that they let slip through.

I think I may have posted it somewhere on FR a few years back.

[hocndoc]

Actually, the evidence shows that the uterus treats the conceptus exactly the same, whether mom is on the pill or not. The timing would have to be extraordiary to prevent implantation.

Look at ectopic pregnancies. The fallopian tubes have no nice, thick welcoming lining, but the embryo implants, just the same.

The most probable scenario is that Emergency contraception prevents ovulation or interferes with the sperm traveling up the tract. I won't prescribe them because of the chance that I'm wrong and, even more, the ethical delemma of intending to kill. with the pills.