Well, my guess was correct: we triggered today! As they say, even a broken clock is right twice a day.
We go Monday morning for our egg retrieval. My RE is hoping to retrieve five or six eggs, but I have my sights set a little higher. When my ultrasound results were uploaded later this morning, we only had measurements for six follicles. I am not sure if he only measured the ones that looked most promising or if something happened to the other four we had on Wednesday. My estradiol has continued to climb (up to 3126.19 today from 1543.22 on Thursday), so I am taking that as a good sign.
Of course, that didn't stop me from trying to learn more. I did some Googling and found that the "vanishing follicle” phenomenon is a thing that has been studied by actual scientists. However, that refers to follicles that seem to vanish between the trigger shot and the egg retrieval, so that's not exactly me either. So, we'll just wait and see what happens on Monday. Hopefully, all of our follicles will still be there...I definitely didn't need anything else to be anxious about heading into the retrieval. I need to stay away from Google and infertility Facebook groups for a few days.