What Causes Foreskin Itching With Discharge, Odor And Redness?

Hi, over the past five days I have bene very itchy under my foreskin after having sex, I have noticed that under my foreskin it has started to produce some sort of liquid and it smells, I have also noticed that my skin is red and some even peeling. I am worried I might have an std, or thrust, does this sound like an std or thrush?