Does anyone know how to read fundal height?

Victoria • • 25 • married • fur mama • girl mama • ❤️

UPDATE: I’m measuring on time, idk why they did fundal height so early but got an ultrasound today and got to see the gestational sac and the yolk sac and everything looks great! Thank you ladies for clarifying it all for me, ob had me stressing!

I had my first OB appointment today, based on my last period I am currently 5 weeks 4 days and today they measured my fundal height and said it was 11. They said it could possibly mean I’m further along or have a larger uterus but was not given an ultrasound or any further information. So my question is if it is that I’m further along, what am I measuring?