Dark Secret

There comes a time in every father-to-be's life where they start to realize they might be in over their head
Mine however came about for slightly different reasons
I married the woman of my dreams shortly after college
a wild but genuine soul
hazel eyes that seemed to glow even at night during some of our more intimate moments
not long after we found ourselves with our first child on the way
I was nervous to be sure but she seemed more so
She insisted she was fine over the months but I could see something to suggest otherwise in her eyes
it came to a head one night when I awoke to find her missing
I combed the house and found no sign
however on a chance look I noticed the door to the backyard was unlocked
a glance outside I found the clothes she went to sleep in neatly folded in one of the chairs
her wedding ring glinting on the top of the pile
what was this?
why'd she take off her clothes?
was she kidnapped!?
Before the whirlwind of grim possibilities could completely cloud over my sense I heard something just beyond the tree line
with the moonlight to guide me I passed through the trees
upon reaching a slight part in the wood I saw something that froze my blood
a great beast appeared a few dozen yards ahead
for a moment I thought it was some kind of bear
but then it stood up on it's hind legs
betraying an almost humanoid shape
pointed ears a long muzzle fluffy tail
this was no bear
rearing up to full extension it sang it's praises to the moon in the form of a long howl
but outlined in the moonlight something else became visible
a prominent curve in it's abdomen
not unlike-
No
I took a step back
only for the snapping of a branch to betray my presence
The beast snapped it's head around towards me
hazel colored eyes glinting at mine
My wife had a dark secret