THCA is only present in blood for 24 hours, so quitting from now till Thursday will be sufficient. I don't think they will cross reference anyway, but it's better to be safe than sorry. The urine test will probably be the drug test and I wouldn't rely on the Ultra Klean detox drinks. They are an unreliable source of dilution and could cause you a failed test result. I would look into substituting with a friends clean sample or Quick Fix synthetic urine.