Hey Steffani!
When I was in the hospital for OHSS, the doc that saw me just had IVF the year prior. She had twins, and she said that you'll never know your real due date and that her docs all fought over which to say her due date really was. Maybe because it was twins? I think its pretty easy to say that you can calculate your due date by using your egg retrieval date as your ovulation date. I did that, and thats the date my RE gave me, using her 'calculation'.
I'm a repeat C-section, so at 9 weeks they will do a 'dating' ultrasound which always pushes me back anyway. So I can't get caught up in due dates just yet!
(-:
But good luck and let us know how you do!!!
2003, 2005 and 
2010- IVF/PGD
2012, back to the grind, TTC baby #4, would love to give DD a sister but a boy would be great too! History of recurrent losses.
IVF/PGD June 2012- 20 eggs, 11 fertilized, 3 were genetically normal. Transferred 2, BFN (faint positives for a few days, then fizzled out.)
IVF/PGD August 2012- 18 eggs, 11 fertilized, 2 were genetically normal. again, BFP that fizzled out, now BFN.