ready or not

So the vet called and it looks like she ready. I will test her tomorrow and than again on Monday but if all goes normally, which it hasn't, she is ready to be bred. The question is should we try to get to another dog and do a dual sire litter or just go with Tanner. Tanner was never really my first choice for her. They were closely related and more importantly, she always gave me an out to another pedigree away from Tanner. But now how doI call someone and say, my bitch is ready today to be bred and by the way, Tanner has already bred her. So the best thing may just be to go all in on Tanner. Oh these dogs give me gray hair.