Finding out gender

Erica • Mommy to 👶🏼👼🏼🌈👶🏻🎀

My husband and I would like to find out our baby’s gender early. When is the earliest time one could find out and have it be reliable? I have my first doctor’s appointment this Tuesday. So, I’m not even sure how far along I am. Just wondering if anyone here found out super early and how accurate it was.