Nobody likes finding greenish yellow discharge, trust me. Sorry you did. Try not to worry too much though. Does it have an odor? This color is most often the result of infection. But infection usually has an odor associated with it, if you have bacterial vaginosis. A dietary supplement can also turn your discharge that color. If it continues, sigh, you will have to get a vaginal swab to see what it is. They look at it under a microscope and usually can quickly tell you. https://www.healthline.com/health/vaginal-discharge-color-guide#yellowgreen