Yeah, I just also learned how due dates are calculated and was so surprised! Basically, on the day of conception (for IVFers it's the egg retrieval day), you are considered 2 weeks pregnant! I had my ET on April 15 and I'm considered over 5 weeks pregnant! Crazy, huh? :)
Whatever you typed didnt come thru.
you can also use the day of your egg retrieval as your ovulation date to figure out your due date.
******************* has a pregnancy site that will calculate it based on your ovulation date.
Your pregnancy still goes according to your last menstral cycle.
Click on this link & this should help you. I would put the date of transfer into the chart
http://babymed.com/tools/pregnancy/calendar/