Trigger and no period

I have posted here twice this week and not gotten much response. I'm kind of in freak out mode and I'm driving myself crazy at this point... I am 20dpo, nothing but bfn and NO AF, not even the slightest signs of her showing up. I'm sure it's irrelevant but I bled 2days post IUI. My cm dried up two days ago and now it is back to a watery mess. I did a trigger shot this month, for the first time with an IUI. Has anyone ever had extremely long LP or a very delayed period even with a trigger? That's like a garuntee O and period right?! Wtf!!! Is there any reason that I wouldn't be getting a period.. I literally can't find anything online and I'm feeling hopeless. I can't get in to my doctors office until Monday for a beta and we all know they'll take forever to call back. Just any related experiences would be great, I need SOME kind of light. Two years ttc and im just really losing it! Anything is appreciated 😔