If I am going to do something new, I'm making a mental (and financial) plan to include the possibility that I may have to actually do it THREE times before I get what I want.
I figure the first time I'll screw something up ... the second time, the other guy will screw something up ... and the third time, it'll work.
And, if after three times, if it still doesn't work, it wasn't meant to be.
Occasionally, it'll work the first time ... then I can go do some tinkering on something else with the unspent money and time.
We've got our second flush queued up for tomorrow afternoon ... the first time we had 14 eggs, but only 5 were of good enough quality to make their way to the tank. This time, we're using a different bull and we have eight recips queued up to receive fresh implants. Fingers crossed!
PS -- If she's really your best cow, I wouldn't be afraid to flush her at least once more ... maybe twice more. Why? With four embryos, you'll be fortunate to get three pregnancies ... and, of those three embryos, you may not get any females. I'd flush away until you're reasonably confident you'll get at least three heifers on the ground in hopes that at least one is as good as the one you've got now. Good luck!