To the best of my knowledge you have to take the inactive pills straight after the active ones & then go back to the next pack for more active ones. In other words you don't wait till your period stops/starts or anything else, you just take one tablet each day, active for 21 days inactive for 7 = 28 days & then start again. But next time you see your dr if you are doing this right (as above) & your period is still not co-operating (it may take 2-3 months for your cycle to get into gear with the pill) then talk to your dr about it.