If it was several days they may not have been able to pull samples... IDK.
The last BP I had a necro done on was at the vet less than two hours after he died unexpectedly. I didn't get a full report which included the PMV tests (fortunately neg!) from a lab in Georgia for about a week.
As for spacing out, don't worry about it. I was a wreck for about a week after mine died, worrying he had something contagious.