hOW the Hell bella Got PRegNant?

According to Stepenie Meyer:
Vampires are physically similar enough to their human origins to pass as humans under some circumstances (like cloudy days). There are many basic differences. They appear to have skin like ours, albeit very fair skin. The skin serves the same general purpose of protecting the body. However, the cells that make up their skin are not pliant like our cells, they are hard and reflective like crystal. A fluid similar to the venom in their mouths works as a lubricant between the cells, which makes movement possible (note: this fluid is very flammable). A fluid similar to the same venom lubricates their eyes so that their eyes can move easily in their sockets. (However, they don't produce tears because tears exist to protect the eye from damage, and nothing is going to be able to scratch a vampire's eye.) The lubricant-venom in the eyes and skin is not able to infect a human the way saliva-venom can. Similarly, throughout the vampire's body are many versions of venom-based fluids that retain a marked resemblance to the fluid that was replaced, and function in much the same way and toward the same purpose. Though there is no venom replacement that works precisely like blood, many of the functions of blood are carried on in some form. Also, the nervous system runs in a slightly different but heightened way. Some involuntary reactions, like breathing, continue (in that specific example because vampires use the scents in the air much more than we do, rather than out of a need for oxygen). Other involuntary reactions, like blinking, don't exist because there is no purpose for them. The normal reactions of arousal are still present in vampires, made possible by venom-related fluids that cause tissues to react similarly as they do to an influx of blood. Like with vampire skin—which looks similar to human skin and has the same basic function—fluids closely related to seminal fluids still exist in male vampires, which carry genetic information and are capable of bonding with a human ovum. This was not a known fact in the vampire world (outside of Joham's personal experimenting) before Nessie, because it's nearly impossible for a vampire to be that near a human and not kill her.

Well when a boy and a girl fall in love with eachother.... Just kidding... :D

Bella was human on the honeymoon, so that's not a problem. And Edward was frozen in the state that he was, while he was transformed. Meaning, he was able to make children then, so i guess he could also as a vampire. Because the males body's don't have to change (like a monthly circle) to be able to make children.

For more try twilight lexicon

The real question here is are you unsure how pregnancy happens or are you unsure how it happened to Bella?

I think it's safe to say that Edward and Bella had sex and that's how she got pregnant. I believe there's no other way for a woman to get pregnant, unless you surgically insert embryos into her, and that seems like too complex a concept for this book. So, to answer your question, Bella and Edward had sex (which, if you don't know what that is you have a LOT of things wrong about you, ask your parents) and thats how she got preggerz.

female vampires cannot have children because their bodies no longer change in any aspect. There is no changing cycle to begin with, and their bodies couldn't expand to fit a growing child, either (that's why rose or alice or esme can't have babies)

bella as a human can change and have babies and edward with his semi-fluids/venoms which replace blood can get excited and since he's technically not dead just frozen (and his sperm also) the two of them have been able to make nessie =)

On her honeymoon she slept wit edward.

SHE WAS A HUMAN WHEN SHE CONCEIVED.HER BODY CHANGES.