I know this idea has been done before, but I couldn't help myself. Maybe you guys could stick with it for a while? *hopeful smile* Oh, and in case anyone was wondering I don't own this show.

CHAPTER ONE

She was a logical person. Science and rationality all the way, not one to jump to conclusion but always open to every possibility. And distinctly aware of the likelihood or unlikelihood of each.

So when her period was one day late, she barely even dwelled on it. Her cycle had never been completely regular anyway. It didn't come the next day either – not terribly worrying. The day after that, at lunchtime, she remembered that Angela had taken a tampon from her purse a couple of weeks ago and she hadn't replaced it, so all she felt was relief about her missed period.

She was just leaving her apartment on the fourth day when she remembered to run back into the bathroom and grab a couple of tampons. And as she stuffed them into her bag she finally realized that she was four days late.

Her mind jumped to pregnancy for one terrified second before she shook herself back into reality. She was careful with her birth control pills. And there are many other reasons for a late period, right?

Had she miscalculated? A quick check to her calendar saw two small red dots on the 23rd of last month – her last period had been thirty-two days ago.

With an annoyed huff, she left her home and headed to the lab, pushing the subject out of her mind.

-----

"You okay, Bones?"

The curious inquiry pulled her from her troubled thoughts only for a moment, the moment that it took for her to glance at him in the driver's seat and mutter a, "Yes, fine."

"You sure?" He grinned boyishly and continued in a sing-song voice, one he hoped inspired happy, cheerful thoughts in his partner, "You've been very quiet today…"

Brennan sighed and sat up in her seat, absently rubbing her forehead with her hand.

"I'm late," She admitted.

"Late? For what?"

"My period is late, Booth. I haven't menstruated this mon-"

"Whoa, okay, okay! Bones, this," He gestured embarrassedly. "This is something you talk about with Angela, okay? Not with me. Your partner. Your male partner who knows nothing about…Being late," he mumbled.

"What?" She asked defensively. "I'm sure you know that every woman goes through a menstrual cycle and that I, as a woman, do so as well. I don't see why it's so surprising to you. Besides, you asked."

Booth was silent for a while, a blush rising up his neck and settling on his cheeks.

"You're right, I'm sorry," He said, and in a condescending tone that let her know he clearly wasn't sorry and he clearly didn't believe she was right. "I just don't feel comfortable talking about…Cycles..." He coughed, "With you."

"Fine."

He waited patiently, knowing that in a few minutes she would start up again.

Dr. Brennan didn't disappoint.

"You know, there are many perfectly plausible reasons for a late period other than pregnancy. Stress, for example, or a change in schedule. I had a cold last week," She pointed out, as if daring him to challenge her. "Illness can throw off the cycle too."

"I believe you, Bones."

"Yes, you should," She said, her eyes wide, almost pleading. "Because I'm right," She continued after a long pause.

"Besides, I'm on birth control."

"Good for you," He said absently, his eyes on the road, trying hard not to pay attention to her.

"There's only about a 0.2 chance of someone getting pregnant on birth control pills."

"Bones," He sighed exasperatedly, turning to face her for a second. "You're not pregnant, alright? Stop worrying."

"I know. I'm not worrying."

"Good. Because you're not pregnant. You just listed a whole bunch of reasons why."

"Yes," She nodded, swallowing. "There's no way I'm pregnant."

"Besides, you're not even seeing anybody."

Brennan frowned for a moment, confused. "What? What does that have to do with anything?"

"Well," Booth cleared his throat uncomfortably. "You usually need to, ah…Well, it usually takes two people to make a woman pregnant. And you're, um, only one. Person. Only one person."

"Well I'm not seeing anybody, but that doesn't mean I haven't had intercourse in the past couple months or so."

"What, that deep-sea guy?" He chuckled. "He didn't seem like the type of guy who would risk throwing away a future full of sexy Hawaiian hula dancers by forgetting his protection for one night."

"He doesn't work in Hawaii, Booth. He stays just off the coast of-"

"Fine, fine, Bones. You get my point," He paused. "Probably."

"I do, but I don't understand. I already told you I'm on the pill, he knew that too. We're not that careful with extra protection."

"What?! You're kidding, right? That guy? No protection? With that guy? Bones! He's like…He's…He's a walking STD! Anyone can see that!"

"Booth, it's very unfair to judge someone based on looks alone. You barely spoke two words to him. And I've known him since college; I know that he's clean."

"Oh was he welding back then, too?" He asked, not sure why exactly the dumb comment slipped out of his mouth.

Brennan gave him a confused look and answered, "No. He was studying engineering. He got the job right after college because his parents passed away and he had to take care of his younger siblings."

"How noble," Booth replied, rolling his eyes.

"I think so, too," Booth spared a glance at his partner and had to resist the urge to throw up at the almost dreamy look on her face. Temperance Brennan did not get dreamy looks on her face over guys. What was going on here?

"So, ah…You really like this guy, do you?"

"Well I did enjoy him, until he broke up with me."

Booth was silent for a moment, contemplating her use of the phrase 'enjoy him.'

"Right. Sorry about that."

"Why? It's not your fault."

He paused, and then sighed. "I still can't believe you didn't use protection with that guy."

"I didn't say that I didn't use a condom," She clarified, clearly tired of the conversation. Booth flinched. "What? Are you uncomfortable with the word condom, Booth?" The woman teased, smirking.

"No," He lied thinly. "So you did use…protection?"

"Probably. But it's possible that I didn't. We weren't that careful," She said absentmindedly, staring out the window. "You know, sometimes you just can't wait for him to run to the bathroom and get a-"

"Okay, Bones, okay! I get it."

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