Tea that's safe while pregnant?

Has anyone asked their doc about tea that's ok to consume while pregnant?
​I'm confused there are so many kinds of tea. I want to avoid caffeine and any herbs that could be harmful ( I think I read licorice for example is harmful )
​Additionally I read green tea blocks the absorption of folic acid so now that's out. 
​I think maybe peppermint or ginger tea is ok?? Not sure. Can't see a doc for another month.