Scarlett, below is a little summary of my puregon dosages and my estrogen levels as I went through my cycle.

5 days of 150IU, 283 - we get to double the dose of puregon.
4 days of 300IU, 2834 - clinic starts stressing and cuts my dosage back
2 days of 200IU, 9200 - I'm told told 10000 is the danger level so I'm running very close to OHSS here.
1 day of 100IU, 13200 - I'm in BIG trouble here, and told that transfer more than likely won't take place
1 day of 75IU, 14488.
Final dosage of puregon is withheld - the following day I just have a lucrin injection, and the day after that is my trigger, half strength (5000IU instead of 10000IU) to try to reduce the severity of the OHSS.
In the end, I had 26 eggs collected. I woke up from my egg collection screaming and crying where all the other women just woke up and started chatting to the nurses. Seems to me that your levels are much lower than mine, 5 days before EPU I'd already hit the 9000 mark. In comparison, you may get OHSS, you may not be able to transfer, but you more than likely won't get as sick as I did.

Hope this gives you some comfort.

BW