Sure. Unless you take into account the fact that whether or not a womb is present has nothing to do with fertilisation. Nor does masturbation or menstruation. Basically the whole argument is a non-sequitur. I get what you're attempting to think, but it just doesn't work without sperm fertilizing an egg unless you get into cloning.

And yes, following that to the logical conclusion, I think throwing away fertilized eggs in the process of in-vitro is wrong too.