Wolverine and the X-Men by Jason Aaron Vol. 2
When Kitty Pryde appears to have become pregnant overnight, Beast, Iceman and Rachel Grey shrink down and enter Kitty's bloodstream to discover the truth behind her...condition! Meanwhile, Wolverine and Kid Omega travel to an intergalactic casino to win enough money to keep the Jean Grey School going! And when a billion Brood invade the school, Kitty, Broo the Broodling and an army of Bamfs must face a new, unstoppable foe! And if all that weren't enough, Sabretooth takes on Beast in the most vicious fight ever set to paper, and Angel undertakes a dangerous repair mission when Wolverine is stricken with a problem nobody ever thought he'd face. Collecting WOLVERINE & THE X-MEN #5-8.