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How are you doing? As you have already stopped the pill, you should be getting the periods any day next week. In that case, it was a right advise. Once you get the periods start the same pills again, without any break, till the date you want to postpone the periods. This will be a good cycle controller and a contraception.
But, if you feel the periods are going to be delayed to the end of this month, then better start the same pill till the date you want to postpone the periods. Do not forget any pill in between or you will have periods in between.
Just for an information, migraine can be cured by clearing the cause. Noone has found the etiology of migraine. Predisposing factors are lack of good sleep, sleeping too late, using the screens with bright blue light at close distance for long (tab, mobile, laptops, TV, etc.), missing timely meals, sweating a lot, taking too much of physical or mental strain, etc. So trying to make few changes will relieve you of this migraine. You can even start on combined pills, which are more effective than these Progestin pills.