Estradiol question

regmkjones

I have never posted here or anywhere before, but I need some advice. I'm PCOS, I'm on CD 12 of 10 days of Gonal F before a TI/IUI.

CD 3-7 Gonal F 75u, CD 6 E2: 20, CD 8 E2: 786, CD 10 E2:608, CD 12 E2:46 

CD 8-11 Gonal F 37.5

CD 12-13 Gonal F 37.5

Any idea why my E2 would drop so dramatically? My RE did a progesterone test and I did NOT ovulate.

My follicles have been: CD 8: L=14.5 &12 Rt=11 &11, CD 10: L=14.5 &12 Rt=11 &11,  CD 12 L=14,14 &13.5, Rt=11,11&10.5

My left tube is blocked.

My lining: CD8: 4, CD10: 5, CD 12:5

Any advice or info you can give would be GREATLY appreciated. Thank you so much.