The past two days I have had some light spotting in the morning, then by midafternoon nothing at all. When I do spot, it is more brown than red. I'm not supposed to get my period for another 10 days, and I have never had a period come this early, or be this light. (I usually wear an average of 4 tampons a day, and haven't worn a tampon or pad at all during these past 2 days).
I missed 4 days on the pill, so I don't know if it's an early period, or implantation bleeding?

Not taking your Birth Control a directed can mess with your hormones and your menstrual cycle, and can cause spotting or irregular periods. Make sure you start taking them again regularly, or ask your health care provider what to do. Wait to see if your period comes. If it does not, or is abnormal, take a pregnancy test just to make sure.
Good Luck!