Period lasting 3 weeks! Whats going on?

For a couple of months now my period has been extremely abnormal. The first time this occured, my period lasted me 2 weeks with no symptoms but regular bleeding. Only difference in my bleeding is i've noticed more blood clots. I went a week without my period and now the same thing is happening and i'm on my 3rd week! Whats going on?
Period lasting 3 weeks! Whats going on?
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