7 days before my period I starting spotting, only when I wipe after urinating. Lasted 3days. On the 4th day I began a very light period that lasted 5?

Metrarrhagia. It is prementrual spotting or metrarrhagia and for your age group it can be observed unless it happens repeated more than 3 vaginitis, months and then you need to see your gyn. Of coarse you have to rule out simple problems eg.vaginitis,uti or simply mild truma. good luck .
Hormonal imbalance. Which is common at your age. Don't worry.