Newborn spit up

Je

My 1 week old baby spits up after every feeding usually twice but it seems to be more and the last feeding I did he threw up 6 times and a few were projectile enough to clear the changing table and end up on the floor. His spit up is also normally white but the last spit up was yellow colored. Does this sound like colic or something else. When should I call his pediatrician. He already has an appointment on Thursday morning.