Welcome to HCM,
To postpone menstrual period, T. Primolut-N should be started three days prior to expected date of period in proper dose, and to be taken in continuation. Nasal spray
should have no effect on menstrual cycle. Ideally bleeding should start 2-3 days after stopping the intake of tablet. As you are not having bleeding for eight days after stopping intake of tablet, you should get pregnancy
tested, if you are sexually active. If not active, consult a Gynaecologist for required investigations.
Wish you good health,