Looks like she needs affection and confidence, but is too scared to go to you for it. Maybe she is scared of being rejected? Or maybe she just doesn't like you that much but is too scared to end things?
Sounds like the baby obsession is about creating a new relationship and replacing you with someone she believes she will adore and believes will adore her.
But, whatever her insecurities are, she is treating you badly, esp as you are making a real effort to talk to her and she isn't playing ball. You shouldn't put up with this, even if you do love her. And your contraceptive method is just a timebomb waiting to go off. Get her to sort it out or you will have a screaming baby on your hands, and neither of you will be any happier.