Vanessa is a werewolf you're a hybrid part werewolf and part vampire. Vampires and werewolves are at war with each other and have always been at war constantly. It's forbidden for them to have ay interaction with each other. Vampires and werewolves have territories that they each must stay clear of.

Vanessa had a one night stand with you but she didn't know you are a hybrid, she thought you were just a werewolf. She tracked you down to your home once she found out she was pregnant. As soon as you open the door she tells you with no hesitation.

"I'm pregnant and its yours.. you're the only guy I slept with."

She says to you. She wasn't nervous to tell you and she would have this child with or without you.