The Breaking Dawn trailer was released this week to eager Twilight fans anxious for clues about the second-to-last installment in the movie saga.

While the Breaking Dawn book series was divided into three volumes, they will be condensed into two films. The second Breaking Dawn is expected to be released in 2012.

The Breaking Dawn books were considered the most controversial of the Twilight series, due to a controversial storyline involving pregnancy and a potential abortion. As the trailer reveals, newlywed Bella Swan unexpectedly becomes pregnant with a half-human, half-vampire baby who threatens its mother's life. The trailer also hints at what those who read the books know: The baby is growing at a monstrous rate -- and Edward Cullen wants his wife to abort it.

The fetus isn't compatible with your body, Carlisle (Edward's stand-in father, who is a doctor) tells Bella. It's too strong.

It's crushing you from the inside out, Edward adds.

Twilight saga author Stephenie Meyer explained on her Web site -- in alarming detail -- how vampire childbearing works in her fantasy world:

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...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...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.

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...because it's nearly impossible for a vampire to be that near a human and not kill her.

Phew! It looks like Breaking Dawn will also address Edward's struggle to make love to Bella without killing her -- he is seen clutching a window ledge, shirtless, in what appears to be their bedroom.

See for yourself here...Unfortunately the movie itself is a long way away: Breaking Dawn: Part 1 will premiere on November 18.