How far along do you think i am?

ok well when i first got pregnant i didnt kno my LMP and i told my dr. that i guessed about november 15.. cuz i kno it was in november and i kno it was before the 20!! so they gave me the due date of august 22. well back at the end of january and the begining of february i went to the emergency room twice both which gave me due dates around the 11th of august.. approx. 2 weeks further then what i thought i was! well my dr. sent me for my anatomy scan and said they would start going off that due date.. when i had the scan done the tech told me i was 21 weeks and 3 days at that time witha due date of august 3rd! well when i went back to the dr. they said they were chanigng my due date to the 30th cuz thats what the anatomy scan showed but i thik it was a typo cuz they told me the 3rd and i kno for certain im more further along then being due the 30th!! once i found out it was the 3rd i startd going off that.. but now idk what to go of off.. i hate not knowing when my due date is and how far along i am! if you were in my posistion what would you do??? how far along do you think i am???