Letrozole, Dexamethasone, and Trigger lnjection

So I had surgery in May to clean out my endometriosis. We were given the all clear and my husband and I did our first round of Letrozole days 3-7, continued dexamethasone, and a trigger injection on day 11. We did timed intercourse, and I took a pregnancy test day 25 that resulted in a BFN. I am now on day 29 and have not yet had a period. I ended up taking another pregnancy test that still was BFN. At what point do I need to call the doc and be worried that my period has yet to start? Also, has anyone been successful on this protocol? TIA