Sex Before Marriage

So i became a Christian last year, I am in a relationship with the father of my child. We been together for 5 years. I tried to stop fornication but its really hard since we already living together and want another baby. Because of some circumstances i cannot get married right now, maybe in 5 months. We tried but we don’t think we can wait that long and i feel bad and confused. I feel like i have lost my communication with God. But by heart i know its wrong and i am trying not to do it or to accelerate my wedding.