Your chances aren't all that bad.
Lets see now......
We only care about the last 4 weeks.
you said you only smoked 3-4 times in the last month = about 12-14 Days to get clean
then you smoked Mon and Tue(how many times??) = anywhere from 6-14 days to get clean.
If you could provide exactly when in the last month you smoked and how many times I could give you a more accurate estimate.
I only know cause I've been drug tested hundreds of times and I always push the limits. I've failed some and passed others. I failed using those system cleaners after 2 weeks of not smoking and I passed after smoking earlier that week. All my tests have been court appointed so diluted was not an option(dilution = failed).