Help help help.

Ch

So i Stopped my birth control a week before the end of November and I’ve had three periods sense. Usually they are medium flow and last from 5-7 days but this one was heavy as hell but only lasted 4 days? Now it’s barely there and what is, is brown. Is this normal ??? Is my body pretty much used to being off the pill now or..?& How long does it Usually take for your body to regulate?