Bleeding...

So I just started taking the pill 4 weeks ago I started spotting the third week that soon turned into bleeding that would turn the toilet red and fill about 4 pads a day then the fourth week it slowed down and turned to brown blood I am filling a pad a day with brown blood. I have been bleeding a total of two weeks. It's this normal? If so about when do you think the bleeding will stop is very annoying....