no pd 1st round letro, starting 2nd round without pd NEED HELP!

Question for those of you who have done Letrozole...

I did my 1st cycle, it was a total bust. I did not get a period (cd 33 today). She wants me to wait to start my 2nd round of Letrozole on Saturday even without a period.

Now, what cd would that be then if I start it on Sat? Do I continue with this cycle? Or do I start from cd 4-8 like last time ... ?

What did you do when this happened? I hear it is pretty common esp with pcos not to get a period your first round, I just wanted to know what cd to start on. If possible.