Do be aware that if anyone suffers with migraine, especially migraine with aura using the combined pill (which is usually the one with estrogen which is used to stop menstruation), there can be a significant stroke risk.
I had to stop using the combined pill when my migraine with aura attacks became more frequent, the symptoms were incredibly like having a stroke. I thought it was due to stress but once I stopped the pill, they went back to one every 6-12 months.
By the way I didn't use the pill to prevent periods, only as contraception but thought it worth mentioning in case anyone with migraine is reading.