dear user about your question i would like to tell you that these symptoms of yellowish or greenish discharge with refer to possibility of having urinary tract infection urinary tract infection may be due to viral or bacterial infectionor fungal infection............so if you found small blisters and itching it suggest viral infection of hsv2 virus that aquired by sexual contact you need to do urine analysis test as important investigative test of bacterial infection as in this case you should have antibiotics for treatment ............... urine culture and antibiotic sensitivity test will detect simply the way of treatment and selection of the approbriate antibiotic that will give best results with micro organism detected........... it shouldnot make you worry about it but you should drink alot of fluids that make your urinary tract flushing any contamination.............limit your sexual activity untill treatment completed..................wish you healthy life