The other thing to keep in mind, orchids do grow very slowly. It seems like a glacial pace compared to other garden plants so don't expect to see huge growth especially with a new plant that has been shipped.
Also don't think you're doing anything wrong if the plant doesn't seem to be growing. Lots of different things like a change of light or temperature can stop growth for a time. These plants are epiphytes that take a lot of their nutrients and moisture from the air. So keeping up humidity and keeping a little spray bottle handy with very dilute fertilizer will help keep it moving at that slow pace.
