I have only been on it for two weeks and I haven't ever been on the pill before so it makes sense when you say that it just takes time for it to regulate into your body. For the first five days my period was normal and now it is just quite light but has been continuing for a week and a bit after the normal time :-(.
it depends on how long you've been taking the pill. i know all birth controls are different, but they have a lot of similar side effects. i was on yasmin, seasonique, kariva, and now sprintec. the first two that i mentioned: i had my period for about a month. sometimes it just takes a while for your body to adjust. for me it eventually regulated. if it continues longer than that, i would suggest visiting a doctor