It's usually recommended to have an HIV/STD/STI test about 1-2 weeks after having casual sex. Some usual symptoms that may afflict a person if they have this disease are notably the presence of a yellowish or whitish discharge, private areas itching, or mild or moderate pain. These infections can be caused by different species of bacteria, viruses, fungi, or other types of microorganisms. It is vital to get tested or visit a specialist as early as possible.