The Ugly Betty star got engaged to director Ryan Piers Williams in June.
The couple then visited US troops in Iraq and are now promoting The Dry Land. The film stars the actress and was written and directed by Williams.
Ferrera told People: "If there is a scale between 0 and 10, I'm at like negative 10. I haven't gone there and [am] not thinking about [wedding planning]. We got engaged and then left for Iraq the next day.
"We both talk about it (the wedding). It's so crazy because right now the only thing I'm sure of is that there will be a cake and music!"
