My 6 Week Old Has Been Throwing Up, Not Projectile,

My 6 week old has been throwing up, not projectile, but this isnt just spit up, for the past week. They said to make sure he is burpingwell, normally ge doesnt. We have been doing with burping but he is throwing up more now. He just threw up shortly inuo his feed mucousy tan with brown streaks. Should i be taking him to the ed? He had gas during tge day and 1 big bm.