I keep getting my period

Hey gurlllssss, 
So I'm on the rod and at the start I hardly got my period and now I have to get it removed in a couple of months, but lately I keep getting my period like it's not heaps but it's a good amount of blood and it turns a brownish too, my question is 
Why is it a deep brown/ red ?
Why am I getting them heaps (3times in a month and a bit)  ? 
Should I be concerned ? 
And I haven't had sex in like over a year, I've just thought it was because of my rod coming to a end but thought hey I'll ask the girls!