Hi, I've been sick for about 3 days now. Just a small cold and a sore throat. Mild runny nose. Not too bad, but when yesterday I felt sometime in my throat and when I coughed and tried to spit it out in the sink what what out was a big rubbery like mucus with some blood in it. And today just now, I blew my nose and it happened again. Right after it happned, my sense of smell improved. What is it? Should I be concerned?