If you check my last few posts you'll see I have been dealing with very similar issues, including bad E2 and a nice 10mm follicle that evaporated... grr. I got some great info if you go back and read those posts.
I think it's smart to try it, it could work, which is why they are trying it. But, just keep in the back of your mind, it could shoot up your FSH level. I wasn't mentally prepared for that. Hopefully this will not happen to you but just be aware that it could, OK?
Mine jumped so they put me back on the estinyl. We'll see what happens on Monday, we are doing bloods but no ultrasound.
Best of luck and I sooo hope it works out!