No period yet what next?

Some background info: I am starting a new protocol so I don’t know a whole lot about how this really works. I am basically on an IVF type protocol but I’m will be doing IUI.
I was on BCP (desogen) which I started on cycle day 3 which was 2/1 and I continued
BCP until 2/17 when I added Lupron (10 units). So I was taking BCP and Lupron
from 2/17 until 2/21. I have been taking only Lupron (still 10 units) since
2/22. The plan was that I would start Gonal-f daily on cycle day 2 and reduce
the Lupron to 5 units daily until my trigger shot and then have two IUIs.  My cycle outline says that I should expect my
period sometime between 2-5 days after I stop my BCP. Okay so here it is 2/25
and no period, no sign of an impending period. I’m starting to get paranoid
about not getting my period and what that means. If I don’t get my period by
2/26 then I will go in for an ultrasound on 2/27. So after that long story my
question to people in the know is what if I don’t start my period? I know that
when on BCP you’re not getting a real period you’re just getting withdrawal
bleeding so my question is, is my period necessary to continue with my cycle? What
is the next step from here? Is my cycle a loss? Will they induce bleeding and
then start from there? Will I just move forward as if I had a period? I mean I just
don’t know where I go from here so any help would be greatly appreciated.