Alright I'm sorry I didn't even know I was on here as a male, I'm honestly 17 years old and a female.
Typically pink an mean a couple things, 1) possible pregnancy. There's a thing called implantation bleeding that is VERY light pink spotting that you really only see when you wipe after peeing. But you have not had sex and are not concerned about pregnancy. So that rules that out. 2) you could be starting your period soon. I know personally a few days before I start I can sometime spot very lightly. 3) is it possible you guys were a little rough the last time you and your boyfriend were intimate? Does he have longish finger nails? If so he may have scratched or irritated the inside of your vagina an that could be the cause of the spotting.
If all else fails and this spotting doesn't resolve itself or you have abnormal smell, discharge (more of it, a change in colour or texture) please go see your doctor!
Your question should be directed to a doctor. First of all it makes absolutely no sense since you are portraying yourself as a female of 17 and signed onto this forum as a male. Maybe you need to back up and find out who you are.