
If you've done this before, don't you realise that although the discharge may be blood coloured through the first 10 days or so, by the time most (and this is in general) bitches are ready to mate, any discharge would have gone to a pale straw colour and be less copious. Some drip more than others. At what point did she accept a dog when she had her previous mating/litter?
I didn't do all the pre-testing that appears to be done these days - and frankly it's a wonder we only had one miss, and that to a male who proved not to be fertile as he missed to every other bitch that went to him - he was of interest as he was an American Ch. imported into Canada.
Yes if you have money to burn, have all the testing done, but quite honestly I don't contribute to the income of my vets, if I can avoid it.
No two seasons, or pregnancies are the same, but what happened before with your bitch, should be a yardstick. Up to you.