It is definitely a blessing if you are not trying to conceive. However, I'm not so sure that I would consider it a blessing if I was trying to get pregnant.
After coming off birth control, I too, had very light periods where i would only need to use a pantyliner - no need for heavy pads or tampons. It turns out that my uterus had stopped producing enough of a lining for a fertilized egg to implant.
We have now been trying for a couple of years to get pregnant. If I'm not pregnant by November then we will be moving on to injectibles. Hopefully the shots will help my lining to thicken up. If not, I'm not sure what we are gonna do!
I have been going for acupuncture for the past 7 months, and it has really helped. My periods have become much more "normal" which is a very good thing if TTC.
My advice would be to see your doctor about it, if the light periods continue for too much longer. I would hate to see what is happening to me happen to you. It sure isnt fun!
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Consider it a blessing. ;) I also have months where bleeding is only 2 days.