This fic takes place in the present time everything is as is on the show.

Disclamier: Yeah I own Castle! Not! If I did I'd be hanging out with Stana and Nathan and there would be a Castle baby on the way! I do own all 5 seasons of Castle on DVD, 4 Nikki Heat books a Castle calendar and a Castle t-shirt!

Summery Just as Kate is at her happiest a threat from the past resurfaces

Chapter 1: Kate's Past

Kate Beckett was chasing down a prep when the guy stopped and turned to face her. Before she could do anything the guy grabbed her kicking her in the stomach when she was down he kicked her a second time before he ran off.

"Beckett!" Esposito screamed running to her as Ryan chased after the guy

Kate moaned in pain she wished Castle was there but he was at home finishing the next chapter of his newest Nikki Heat novel. She tried to sit up but Esposito stopped her.

"Don't move chica you could have broke ribs or internal injuries an ambulance is on its way"

"I'm fine Javi I don't need an am" she winced in pain when she tried to get up "Okay you win" she groaned

The EMT was loading her on the ambulance when Ryan returned "The bastard got away" he told his partners, his friends. "Are you okay" he asked Kate "Want us to call Castle" he asked

"No I'm fine" she replied. She did want Castle to be there but she knew he was on a dead line and she was fine so there was no need to worry him.

At the hospital Kate laid on a hospital gurney in a paper gown the door opened

"Hello Detective Beckett I'm Dr. Katic" the pretty intern smiled introducing herself as she lifted Kate's gown to examine her stomach

"Oww!" Kate winced loudly tears in her eyes when the doctor pushed down on her abdomen. The doctor bit her lip and looked her

"We're just going to do an ultrasound to make sure there's no internal bleeding or internal injuries" she explained bringing the machine over. She gently rubbed gel on Kate's stomach and began to gently glide the wand over her stomach. She looked at the screen with wide eyes "Detective Beckett" she started

"Kate" she corrected the doctor "Is..is something wrong" she asked seeing the look on the other woman's face

"Kate" Dr. Katic started "Why didn't you inform me you were pregnant" she asked

"I...I'm not pregnant" she answered her and Castle had been discussing kids even though they'd been worn out they loved taking care of Cosmo but they hadn't started trying yet she was still on the pill

"Yes you are" Dr. Katic smiled pointing out a tiny bean shaped object on the screen

"Bu...but how" she stared at the screen "I'm on the pill" she added more tears forming in her eyed

"No form of birth control is 100 % affective even when used correctly" the doctor looked at the screen "You appear to be about 8 weeks along"

Kate closed her eyes she knew exactly when this baby was conceived that night after closing the case and finding Cosmo's parents when they got back to the loft she kissed him telling him they may not be ready to start for a Cosmo of their own but they could practice. Castle grinned and scooped her up carrying her to their room they made love several times that night.

Kate blinked and looked at the screen again "Is...is the baby okay" she asked worried the kicks to her abdomen may have hurt him or her.

"The baby looks perfect and there's no signs of bleeding" Dr. Katic smiled she printed a picture of the ultrasound handing it to Kate "Make sure you get in with an OB right away and congratulations"

Kate thanked. her and started to get dressed. When she was finished she picked up the grainy black and white photo staring at it she was having Castle's baby she hoped he'd be as happy as she was about this little surprise. She held the photo close to her as she exited the exam room. She walked through the halls of the hospital glancing down at the image of her baby when she ran right into someone causing her to drop the image.

When Kate looked up to apologize she saw the face of her ex boy friend Josh Davidson.

"Hello Kate" he said coldly "What brings you here" he asked

"No…Nothing" he voice trembled . She was a fucking cop why did she let this guy scare her

Josh bent down picking up the image "Hmm this doesn't look like nothing" he replied studying it "It looks like a 8 week old fetus to me" he looked at her "so who knocked you up" asked

"None of your business" she snatched her ultrasound from his hand that's when he saw it he grabbed her hand roughly "knocked up and engaged huh so who's the unlucky bastard"

At that moment she heard his voice calling her name "Kate" Castle called out racing towards her.

"The writer! You're marrying that lousy writer!" Josh snorted

Kate shoved the ultrasound in her coat pocket and looked at him "Just go away Josh" she whispered

Josh smiled "Fine I may be back though you were a good fuck" he whispered in her ear winking before he left.

Kate was shaking when Castle reached her "Hey you okay" he asked wrapping her in his embrace "is it more serious than the boys told me" he asked worried

"No I'm fine" she whispered "Castle" she looked into his blue eyes "Take me home" she almost pleaded wanting to get far away from the hospital, far away from her ex.

He nodded leading his fiancée toward the exit

"Castle" she started

"Hmm" he replied

"Would you love me no matter what" her voice a whisper

"Always' he promised

Kate fought the tears in her eyes hoping that was true, that her secret wouldn't be their end

Chapter 2: Nightmares… Kate's run in with her ex causes her to have nightmares what's her secret will she tell Castle about it?

Author's Note: Hello Caskett lovers I know I have to update Castle's Biggest Fan but I have a serious case of writer's block so I had this idea and decided to give it a go I hate Josh! He was a smug bastard if you ask me. I know some of you will hate what the secret is saying she's a cop yada yada. Cops are human they make mistakes; they get scared so just give it a chance please. Read review and enjoy. Constructive criticisms welcome but please no flames. Caskett hugs for everyone!