I had a dating scan as my cycle length had been quite irregular even though i had been charting i was not positive of the date of ovulation. My last missed period indicated hendrix would have been due on the 7 July, the first dating scan said 3rd July and subsequent said 1 july. I went with 1 july although later in pregnancy regretted that as i thought if he came super late i could have been induced when in fact he wouldnt have been overdue at all (as well as the pyschological aspect of going over the EDD). Thankfully Hendrix was born on the 26 June so he came quite a bit earlier than the EDD from the LMP.