I got my BFP at 11dpo (hadn't tested before that, and was trying not to test before AF due!). I was so convinced I wasn't preg this cycle that when I felt funny (sicky, upset belly - just like with DS) I thought hang on I better test! My bbs are usually sore from O to AF, but this time that stopped at 4dpo and didn't start again until 12dpo. I had no implantation bleed, whereas I did with DS.
Things I did different the cycle I got my bfp were - I took evening primrose oil from cd1 to O and DH took Zinc and Vit E from CD1 to O. Which is what we did the cycle we got our bfp with DS too! can't be just coincidence can it?
Good luck - post here any time for anything!