I would value Any advice.  I had my bitch progesterone tested and the result was >63.6.  The vet said she should be mated the next day.  Off I went to get her mated.  A tie took place and the following day.  Needless to say she didn’t conceive.  Was I too late?

I’m surprised they said to wait until the next day. Very possibly too late unfortunately:

0-2  nmol/L           Baseline concentrations too early to estimate ovulation
3 - 6 nmol /L        Minimum 2 days before ovulation expected however result of 3 - 4 nmol/L may persist for a week or longer before increasing. Earliiest estimating breeding 4 - 6 days but could be longer (re test needed)
7 - 12 nmol/L   Minimum 1 day before ovulation. Estimated window for breeding 3 - 5 days but could be longer  ( re test recommended)
13 - 18 nmol/L   Ovulation impending or just occurred. Estimated breeding window 2 - 4 days 
19 - 31 nmol/L   Ovulation recently occurred. Estimated breeding window 1 - 3 days
32 - 64 nmol/L   Ova have matured, optimal potential for fertility.  Estimated breeding window  0 - 2 days
65 - 90 nmol/L   Ova have matured but aging, decreased potential for fertility.  Breed  at once
Above 90 nmol/L    Too late

Yes, too late.

Worth baring in mind some bitches have very small windows and can go over very quickly. Mine are like this, mate on day or day after ovulation or its  waste of time.