What does it mean?

Alana • 17 year old junior from West Virginia!☺️
So I've been spotting off and on and it's like a light pinkish color but I'm not on my period because it's not the same there hasn't been any of the uterus lining stuff and it's been going on since the day before my birthday which so about 4 days and I'm not having cramps and it's not enough to fill a pad it's not even going in my underwear or in the toilet when I pee it's just when I wipe so what do you guys think it is?