Unusual bleeding

Okay so on The 17th I threw up only once and then later on started spotting and now I’ve been bleeding every since but it’s not period though well it is and isn’t there isn’t enough blood to soak a pad or tampon I use a panty liner but I also had my period on the 2nd it lasted 8 days and last time I had unprotected sex was on the 12th I doubt I’m pregnant I just need answers never experienced anything like this