
The book is very good, but many of us find our bitches differ.
I have never had straw coloured discharge, though as you say paler blood, but often had it very much darker the last week of the season, and not just when they have been mated.
I have also had them bleed for up to a month, still carry a litter, and no signs of infection (one bitch did this on a non breeding season, and also the season she was mated, and I had her vet both times for infection as worried.
I also find that bitches vary greatly as to when they re ready, there seems to be breed and familial tendencies here.
I have never had a fertile mating before day 14 with any of mine, and latterly have had some bitches not ready until after day 18.
If I am travelling int eh UK I normally don't bother visiting the stud before day 14, and when I have gone abroad have gone on day 10 or 12 and stayed until around day 20.
On both occasions going abroad I have flown so had to book tickets the day the bitch came in season, so no point blood testing, just ensure I COVER MOST LIKELY DATES IN THE TRIP.