
Sounds like a nearly test result, unfortunately they can stay that way for a few days before the test shows actual ovulation. Once ovulation itself has occurred you have about 48 hours until the eggs are ripe and another 48 hours before they die.
When I had the blood tests knowing my bitch and her previous behaviour I had a blood test done on day 11, which showed she was nearly ready to ovulate, the same next day,a nd on the third day that ovulation had begun. She wasn't mated until 2 days after that.
You really need a series of premate blood tests starting with a definite not ready then when the tests show the levels rising test daily until you get a positive result.
If you had the quantitative Elisa test and the results were above the levels at which the average bitch ovulates then you would have as I said about 4 days from ovulation.