First of all, a child is of both parents and not of a single parent. As you found out that your wife is pregnant that means you both are becoming parents. Both parents have equal rights on their children. As it’s your child, you have the whole right to know about your wife’s pregnancy and your child. Even if she wants to abort the child, she needs to discuss this with you. Abortion is a very complicated and delicate process and you have every right to object to it. You need to confront her immediately but try to talk to her calmly as she is pregnant.