Do not, under any circumstances, attend that wedding. Talk openly and honestly with your cousin/boyfriend,father of your baby about the future. This is crazy. He already has an obligation--to you and to his child. What are YOU thinking even considering allowing him to marry a girl who doesn't even know he is about to become a father? She deserves to have a choice of going ahead with the wedding or not. Being cousins does not mean the two of you cannot marry in many states. Goodness, if two men can marry or two women can marry why not two cousins?