Have you charted, got pregnant, but had conception date wrong?

[Heaven]

coooooooooooooo-eeeeeeeeeeeeeeee

[visitor08]

according to my LMP I'm due 27 May, but my cycle is 39 days long, I also know when I ovulated, and I had a egg implant bleed on the 20 September, so then my due date was 7 June. Now due to the 20 week scan, bubs is 1 week 2 days ahead, so I am back to being due 29 May. Which would mean it took 24 days for the egg to get to my uterus. Go figure.