Help I spit up blood idk what to do?

So I have been clearing my throat alot the past few days and not eating as much but I was laying down and I random decided to spit in a napkin and my spit was straight red and foamy and so I ran downstairs and started spitting and it was like 5 spits of red and then it turned pink and now it's gone I'm wondering if I should be concerned or what? Thanks guys I'm just freaking out cause I don't want to go to the emergency room for no apparent reason