Thanks for query.
You have irregular delayed periods due to hormonal
To regular it your doctor has prescribed you a hormonal pills that will mimics normal menstrual pattern so your endocrine gland
learn how to produce it.
It will take at least 3-4 cycles to learn.
After stopping 21 tablets you should get withdrawal blled as if you gets your period within 5-6 days.
In your case you have started spotting.so wait for more bleed.