Hi everyone. Relatively new owner here 

 Jasper is currently a little under 6 months old.  Yesterday, I found little splatters of blood on his toy.

 When I checked his mouth, I saw some bleeding in his mouth. It seems to be the 3rd tooth towards the back from his canine tooth.  I didn't hear anything from him (no whining, crying) and he seems to be chewing just fine. I'm not able to tell if there's a tooth missing there and if it is, whether it is a puppy tooth or an adult one. Really worried that it might have actually been an adult tooth that was growing in, but I'm not too sure myself. I do have an appointment tomorrow with the vet, but wanted to know your opinions and whether the vet visit is needed. I attached the images below. 
Thank you!