One day period on the pill????

Lu

I took the last pill in my birth control package on July 8. Yesterday, July 12, I had a very light period that hardly filled a pad. My period has since stopped fully. I now have three more days of "period" with nothing until I start my next package of pills. I'd like to add that I haven't done anything sexual this cycle, and my last period was absolutely normal. Is this one day period normal or should I be concerned?