Knowing how long your cycles are 35 days long and that they've been pretty constant at the for quite some period. That would mean if you had a luteal phase of 14 days (ave) you O'd on day 21. Therefore, I'd have to say that it highly unlikely that you'd have gotten pregnant with DTD just after AF finished, which would have probably been around day 5-9ish. The other spermies would have well and truly died by the time you O'd.

:hugs: I hope it all works out for you.