I received the flu shot a couple months ago but now im sick with an runny clogged nose, a constant cough along with spitting up phlegm, is it the flu?

This sounds more. Like a cold. Cold symptoms can include nasal congestion, runny nose, coughing, headache, sneezing, sore throat, watery eyes, mild fever, feeling tired ; watery eyes. Tips: sore throat – gargle with warm salt water (1/2 tsp salt in 8 oz of water). Get strep test/culture if very sore. Congestion – saline nose drops or netti pot. For anti-inflammatory effect ; mobilizing mucus- homemade chicken>.