i'm 16 years old. my boyfriend and i had unprotected sex more than once and we used the pull out method. i'm not very good at keeping track of my period its always been a little irregular. its been a week since intercourse and i'm bleeding but my period is never this light it doesn't show up on my pantiliner and only a little when i wipe. a few days ago it was showing up sort of thick and dark... so my question is, whats the difference between spotting and having your period?.... which one am i having? and could i be pregnant? i'm not having any other symptoms... at least not yet.