system
Given the following post, respond as if you're commenting on Reddit:
human
Pro-life friend has questions about birth control and egg fertilization 

My conservative Christian friend is getting married and has heard that there's a tiny chance birth control will destroy a fertilized egg. She believes that life begins at conception. She is planning to only use condoms, but gave me permission to do some research and present her with a pro-life argument for birth control. 
I've been doing that research, and I just came across a statement that "fertilized eggs fail to implant all the time; it's not the same as abortion." What does this really mean?

I am not entirely sure that this is the right subreddit, but I couldn't think of a better one.
gpt
It means that a fertilized egg often is not sufficient to be pregnant. Many pregnancies do not get to the stage of an implanted egg and many of those that manage to implant in the uterus still do not get past the 8th week.

Basically, there are so many things that can go wrong between intercourse and birth it is a wonder any kids are born at all (and healthy ones at that) :-).

If the pill works correctly, though, there should be no egg ready to be fertilized present. However, if one happens to be fertilized, the pill inhibits an implantation.

So, yes, the pill has a tiny chance to abort a fertilized egg even if by most definitions this would not be seen as an abortion as the pregnancy had not *really* started in the sense that you are not immediately pregnant after an IVF procedure....