Just wondering, how many people here use BioTracking? What's the earliest stage and latest stage you've pulled blood for and how accurate have you found it to be? Do you do it all the time or just in certain situations? (A.I. over live cover or...???). How many use u/s to determine pregnancy? How costly have you found it to be? Does it "pay for itself" in your opinion? What tests do you do on an annual basis and which companies/labs/vets do you find to be the most reliable? Best priced? Quickest?