I am 16 years old and sexually active, but I am on birth control. My period is light, but heavier than spotting, I am confused as to what it is? I feel no pain, nothing different. Nothing indicating pregnancy like weight gain, bloating, cramping, headaches, dizziness or anything. No sore or tender breasts either. My period isn't even heavy enough to bleed through a tampon, or even a pad. I wear one pad throughout the entire day and I'm fine. What could it be?