Thanks for the query.
Sometimes the withdrawal bleeding will take around one week to occur after completion of the dosage.
And sometimes 5 days course is needed to induce withdrawal bleeding.
Now you better wait for four more days and possibly by that time you will get withdrawal bleeding.
If not consult your doctor once again and undergo ultrasound
Depending on the scan findings the treatment can be modified.
Usually mild yeast infection etc. may not affect the menstrual cycle.