
Some males may mate a bitch just because she allows but realise she is not quite ready, and then not want to mate her until the right time.
As semen should be in good condition for at least 4 days I would go back on day 14.
If he shows no interest it could be she was a very early ovulator.
If both are keen and you get a mating, I'd return again 2 days later ( if travel is not a big issue).
If your able to get same day result progesterone testing you could check whete she is.