Medicine Runs Out?
, I have to go back to the doctor, he said, counting 12 menstrual days, now that’s right on Sunday, because my practice week is closed, so do I go on day 11 or day 13
When there is an obstacle to return to the doctor at the specified time, then advancing the control time is the most appropriate option (in your condition that is on day 11). This is to prevent the occurrence of a "withdrawal" condition, especially if the treatment being undertaken is a continuous therapy.
Withdrawal conditions can cause treatment to be not optimal so that the healing process is delayed, and even some medical conditions that experience withdrawal have to get more doses to catch up with the delay, but there are also those who need to undergo treatment all over again, and although rarely withdrawal conditions can causing treatment failure. However, this goes back to what medical conditions are experienced and what types of treatment are there.
So that Shakila is expected to be in control on the 11th day, before the given medicine runs out, so that the withdrawal condition can be avoided.
May be useful