Cleanout timetables that you may have read online (or anywhere) should never be relied upon because they are almost always off the mark. Each persons body is different and there are too many variables to take into account to arrive at a realistic figure - so many variables in which the timetables dont take into account.
What are my chances of passing the urine test in a week?
Nobody can realistically and accurately answer that due to the reasons stated above. Only periodic testing with a THC test kit (using the first void of the day for each time) can give you that answer.