today i discovered a !**@! substance at the end of my urethra. i squeezed it out, and it smelled just like pus and looked the same too. i know this may be a symptom of an STD but my partner was recently tested and cleared, and i had sex only a day and a half ago. (and before that, not at all for a month or two). there is no burning when i urinate, and i do not have any other symptoms. please help.