Don't know if to stop taking Accutane

It is my second time taking Accutane. The first time, I took about 120 mg/kg, maybe less. This time, I have already taken about 150 mg/kg, and I am about to finish my course in a few days. My goal was to have zero acne during the last month of the course, so the chances of the acne coming back would be as low as possible. However, I still get one pimple a week (a small one that disappears after 1 day). So, I am wondering if I need to stop taking Accutane or not. Thank you!