Does anyone know the possible outcome of having low estrogen levels at day 8 of stims?

My follies are ok (i think) around 23 all up with 12 that are between 10 - 12mm, but the nurse told me today that my estrogen levels are not as high as they should be.

I'm taking 150 of Puregon and have been for the last 8 days, they told me that the BT on day 4 of stims was around the 360 mark and then day 8 they were only up to 430?

I don't really know what it means - I don't know where they should be by day 8.

I have to go back in tomorrow for another BT to check a different hormone? To see if my ovaries are working hard enough?

Anyone that has had similar results or can advise what is the expected levels - please please let me know.

The nurse said the size of the fols were ok, just the estrogen levels were lower thank expected. I assumed that they were a LOT lower than expected - by I could have been reading too much into it.

I've been feeling sick with worry all afternoon.

Sorry. Being miserable. I was just so excited this morning that it has been a bit of a shock and disappointment to hear that news.

Thanks
Nic