Wow. This episode was pretty entertaining. Here's an episode summary from TV.com:
After Quahog is hit by a flood, Meg winds up in the hospital in a coma. When she wakes up and sees a cute med student, they immediately hit it off. Overprotective of his daughter, Peter is determined to drive the med student away. That is until Meg reveals that she is pregnant.
Doesn't it already sound great?! Haha, a pregnant Meg. I love it. I thought she was lying about the pregnancy to get revenge, but she actually thought she was pregnant! Haha. I loved that whole storyline, even though the Brian/Stewie one was pointless, even though the Doggy Hell thing was funny.