OMG!! WOW!!! I hate to say it, but I told you that you should have stopped sleeping with her a long time ago. I guess now you know you should have gave it up. No matter what happens I know you will be a good father, but you will just always be connected to this girl now whether you like it or not. I would definitely be sure it's yours though first. You guys were not boyfriend/girlfriend so I think it's still safe to say it could be anyones. You have to be sure of that.