Hi Min,

Yes that might make it abit difficult for you to get a due date. You will probably have to wait until you have a scan that will give you your due date straight away.
Although they can change the due date at the following scan that's what happened to me with my first pregnancy.I had to have a early scan as my Dr and the hospital midwives gave me dates that ranged from 23rdJuly throught to 15th August. Baby arrived on 8th August S&H.
Leah