How does ttc/pregnancy care work in the US...

Laura • Mum to 1💙 after a long time TTC

I'm British but living in New York State (Hubs works at a University here) We have insurance but haven't had cause to use it yet. We're ttc #1 and all signs say I've had a chemical pregnancy this month. My question is do you visit an OBGYN when you start trying or just once you're pregnant? Do I need to find someone now or wait until it happens? Any advice would be greatly appreciated!