Your parents are going to find out if you decide to have the child. If you are opposed to abortion, and will NOT take that route.. then the best option is to get parents involved.
Even if they are not a fan of your girlfriend.. and even if they don't want to help you out.. they know you and your situation best and are probably going to give you better advice than anyone on an internet fitness chat board.
Good luck bro.. think long and hard before you make any decisions.