Well Buttons is the "ice queen" when it comes to season
so really gives you NO indication if she is ready or not
We started premate testing on day 11 and she had one every other day until day 19 and they told me to go the next day, she was NOT happy so in my opinion had gone well over. The next time she was mated on days 10 & 12 but not overly happy. On day 15 she showed me a TINY sign that she might be more ready so she ended up going back on days 15 & 17. She whelped to the day 15 mating. Second time used the Matetel as going a long way and she showed no real signs but the Matetel started to show signs of her getting ready around day 13, very difficult to read though so we ended up going on day 15 and thankfully got it right
she was much better with the dog although not too impressed when he tried to impress her by jumping over her head a few times
I think the premate test is only as good as the Vet doing it and interpreting the results. I have since changed Vets as we seemed to get a different one with each test.