In the Personal Correspondence number one on the Twilight Lexicon it states:
"And since we’re talking physiology…I’ve had tons of people ask if vampires can have babies. The answer is no. When someone becomes a vampire, it’s as if they are frozen exactly as they are in that moment. His or her (and we’ll go with her because it’s more central to this discussion) body no longer experiences change. Hair does not grow, nor do fingernails (if you cut your hair, you’re stuck. That’s why Alice’s hair is so short–it was growing back from being shaved in the asylum). This applies to all changes–so a woman would no longer have any kind of ovulation cycle. If she were already pregnant when she was bitten, both she and the fetus would be frozen in that state. Which would really suck–pregnant for eternity? I’m shuddering at the thought."
So I know that Bella wasn't a vampire but Edward was, and he doesn't have any bodily fluids such as blood or sperm, so how could he have possibly gotten Bella pregnant? It makes no sense.
Also, how could they have intercourse as he wouldnt be able to get an erection as he has no blood?
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