Wrong date

It should be the first day of your last menses. But I don’t think it matters now because gynae will always scan and measure based on the size of the bb to slightly determine the edd. On the first visit to the gynae. I told her the first day/date of last menses and that i was probably 8w pregnant, but when she scan.. bb was about 7weeks based on the size. On and off will change edd but they will use 1 date as rough gauge - don’t worry!