Should I be worried??

My fiance and I have had sex one time, maybe twice, in the last two months. We have never had a super sexual relationship which I was hoping would improve as our living situation improves, but as of now it's getting worse. He's not cheating on me and he has a high stress job which I'm sure plays a role, but wtf am I supposed to do with that? We want to have kids soon and last I checked you need sex to have children, not to mention it's healthy for a relationship. It's just starting to really affect me and I don't know how we can make it better. and then I just feel like the dang cosmos is against us cause when he's finally not stressed one of us is either hurt or sick. Anybody have this experience??