I am sorry but I remember when you were here panning to marry her for all the wrong reasons. Some people got mad when I and few others suggested to not get married for those reasons.
I honestly think that you ought to end this. She sounds like a disturbed individual who is trying to have a child to fill the void in her life. She needs mental health help ASAP to get to the bottom of wanting children immediately and not willing to wait, you need to focus on bettering your own life.
And please do not have sex with her, protected or not, just don’t. This doesn’t sound like a healthy marriage. You deserve better