so.. im kinda confused, i went to a scan when i thought i was 13 weeks exactly and i ended up with two measurements(i saw, i was watching the screen). it was 13weeks and 2 days then 13weeks and 5 days. the EDC said August 30 which is diff from the one i was following, my edd based on my lmp was Sept 4. then when i asked about it, the technician said to just keep following my old due date.. so.. like what am i really measuring as