Legal Question in Family Law in California

No. You can't force anything until a child is born. You can, however, advise her that since she told you she is pregnant, unless she proves she is not, you will plan to file a paternity action in nine months. If she is pregnant, then you need to file the paternity action after the child is born. That is the only way to force her to let you have the baby in your life. Just be warned, however, that it will mean you pay child support too.