Q: Waiting for my k1 visa but found out I'm pregnant

My fiancé and I asked for a k1 visa beginning of March. I am french and he is a us citizen. We found out soon after that I am pregnant with our first child and I want to give birth in the US so that we can be together when the baby is born. What should I do to make that k1 process faster ? Is there a chance to have it in priority if we inform USCIS of my pregnancy now ? Am I suppose to wait for the medical appointment to tell them ? Who should I call to inform them ? Thank you very much !

This question hasn't been answered yet.