Hello Practo user nature of working of primolut and another this type of medicines, this will produce withdrawal bleeding after two to five days of stopping of this medicines. So if you are not prregnant then you will get periods soon. But i like to share you that mostly should have to avoid to take hormonal medicines. if you need to regularize your periods, it needed to get proper Ayurveda treatment, which gives you good health and regular periods as well has without any side effects. Regards, Dr. Nikul Patel Ayurveda consultant Ayurveda Infertility and Reproductive health Expert Ahmedabad Whtasapp - 98250-40844