So you are 9 weeks now by doctor's calculation (in actuality you are about 7 weeks)..
Physicians calculate your expected delivery date by adding 40 weeks (280 days) from the first day of your last period. This means that during your first 2 weeks of "pregnancy," you haven't even conceived yet.
Only your first scan will tell you how far gone you are… they always ask for the date of your last period for estimate but you always have to give or take a week !