Jeez so another thing to worry about for me here! Ugh I hate this whole process, its like an emotional yo yo! Tonight is my last night of stims which is day 9, and I am suppose to take the trigger tomorrow. Today I had my last ultrasound and I had one yesterday also. Yesterday they saw 10 follices between 18-14mm and my estrogen was 2232 pg/mL. Today I went in and there was 12 follicles. One was 11mm and the others were 18-14mm. Besides for the two new follicles, they haven't grown much from yesterday. Is this normal?
Today I also noticed that my estrogen was lower by 12 pg/mL so I asked the doctor what these means. He says it could mean that I am about to ovulate! But he also said my progesterone and LH are fine. Progesterone is 1.3 ng/mL and LH is 1.23 mIU/mL. I'm scared that I'm going to ovulate. I was finally starting to calm down about everything since I'm so close, and now he says my estrogen drop could me ovulation. I am on cetrotide and he of course the doctor knows this. I have read plenty of posts where women do ovulate through the cetrotide.
Has anyone experienced an estrogen drop like this right before trigger? What happened?

Re: Estrogen dropping during stims/ovulating before retrieval?
***Losses mentioned.*** TTC #1 since May 2012. Me: 37, OH: 41. Ectopic August 2012 => tubal damage.
I'm paging @ronniesgirl1981 to this thread, because she had a pre-ER possible ovulation scare with IVF #1. The situation was quite different, but perhaps she can provide you some comfort.
Also on my last medicated cycle when they started me on ganarelix my E2 dropped a little and they said it was fine sometimes that happens. Then again they also did drop my Gonal from 250 - 0 to slow me down. I wouldn't think a drop of 12 is a big concern.
I'm so glad I'm not the only one analyzing the numbers. I have copies from all my medicated cycles and I keep comparing every day.
Good luck on ER!!
TTC since 08/2012
DX: DOR