Consistency of Menstruation ?

I'm 28 yrs old, and have never been pregnant. I've had pretty regular periods since I started at age 13, with no abnormalities to speak of, so my inquiry is more of wanting to know what the following might indicate about my body and whether or not it's going through a change, and what that change might mean: when I hit 27, I noticed there was alot more mucous (and thick!) coming out with the usual stuff when I would have my period from month to month. Before then, I didn't really have as much, or at least it wasn't as noticable then as it is now. I know it's normal, but what does it indicate for my body? What changes in my body could it point to? And, just to be sure, is it normal?