Meredith woke up in a cloud of happiness. She was pleased with the night. Actually pleased wasn't the right word. She was perfect. Her morning was perfect, the night was perfect. Mark seemed to know what she wanted before she did.

She turned around to get out of bed, walking to the shower. It was strange the mood she was in last night compared to now.

The water was a little too hot, but Meredith didn't mind, it soothed her muscles and relaxed her. The steam cleansed her skin. She heard someone opening the shower door. "Grey?" Mark said, peeking in.

"Yeah Mark?" Meredith asked, running her fingers through her hair.

"You seem pretty busy," Mark said, smiling. He stepped into the bathroom.

Meredith grinned. "On the contrary, Dr. Sloan, I think that I'm handling things just fine." She heard someone step into the shower.

"All the same, I think it would be best for me to assist you, Dr. Grey."

Meredith looked up and smiled, and leaned against his bare chest. "Mark?" she paused. "What do I do about Derek?"

Mark seemed to realize that Derek tied into this. It wasn't just a one-night stand. Derek told Meredith he would wait and not minutes later Mark brought her to his house. "You get out."

Meredith turned to face him. "What?" she asked, seeming a bit offended.

Mark looked away from her. "Get out. Forget this happened. Don't get me wrong," he said with a smirk, "it was fun, but you and Derek are the couple people try to be."

Meredith looked at her phone. "But-"

"No buts," Mark said. He ran his fingers through her hair and lightly kissed her on the lips. "Now go and get him back."

Hours later Meredith was ready for Derek's arrival. She called him and told him she wanted a fresh start, and if he was still willing to be with her, he should come to her house at 3:00 pm. It was 3:05, still no sign of him. Suddenly she heard a knock on the door. Meredith jumped up to answer it, but he walked in anyway.

He ran in and kissed her. She kissed him back. But it was different. Before Meredith knew about Addison Derek kissed her sweetly. Now it was rougher, with more of an edge. But still, Meredith still responded equally.

A week passes. They're happy taking it slow. Derek appreciated Meredith's input on everything. Meredith tells him about her day. Derek still doesn't know about Mark. Meredith doesn't look at Mark, ignores his constant flirting at work.

Another week. Derek notices Meredith's different. She seems more anxious. He never lets her get a moment alone. He hovers, at home, at work. Meredith complains of his hovering, they fight. Derek whines about her distance, they fight. There is so much disagreement. Meredith opens herself up to Mark and Cristina, asks for their advice. Cristina has her own problems and Mark says she should give Derek a chance.

One more week. Meredith is sick. She can't stop throwing up. Her stomach is upset and Derek wont even let her shower alone anymore. They're days away from going to the hospital to see what's wrong. Meredith pees on a stick and sees a plus sign. Derek knocks on the door. No answer. He knocks harder. Nothing. He opens the door anyways and sees his girlfriend with the stick and her face. He smiles, he laughs. He grabs her hands and kisses her.

Meredith closes her eyes. She needed to speak or he'd know something was wrong. Derek grinned. "Meredith! We're gonna have a baby!" He hugged her. As she pulled out of the hug, his grin faded.

"Mark," she whispered.

"What?" Derek asked, lifting her face up.

"It's… It's Mark's baby."

Derek backed away in an instant. A few seconds ago he was the love of her life and now he couldn't look at her. He walked out of the bathroom and slammed the door. A few minutes later she heard his car pulling out of the driveway and away from the house.

She was crying. How did this happen? There was actually a 1% chance this could happen. Who knew that this would be the result of one mistake? No. It wasn't a mistake. She didn't regret her time with Mark, but she did regret her time she spent letting Derek convince her she still loved him.

Hours went by. Cristina and Izzy asked what was wrong, she never moved from the bathroom floor. The only words she said were "What do I do?" George and even Alex came to convince her to get off the ground with no avail. Later that night she heard a different voice next to her. Huskier, familiar. It was Mark. She couldn't hear what he was saying, but responded with her own thoughts. "I'm pregnant, Mark."

She looked up, awaiting his response. "That son of a bitch!" Mark said, standing up. He seemed genuinely angry. "Derek gets you pregnant than runs off because he can't handle the commitment? Classic."

Meredith pulled Mark down to lean on his shoulder. "Derek and I were going slow. We were trying to abstain."

Mark was mad for a moment longer before understanding. "So… you two… didn't?"

Meredith shook her head. She was utterly surprised about what Mark did next. He pulled her into a hug. A big, warm bear hug. "Mer! This is great! I'm going to be a daddy!"

Meredith rolled her eyes. "Its not like you don't get girls to call you that already."

Mark held her hand. "Now lets go share the news." They stood up and walked together to talk to their friends.

Hey guys! 3 chapters in one day! :^) Don't worry! This won't be a typical MerMark pregnant fic. I highly suggest you stick through!