i had unprotected sex

The symptoms that you describe could be the beginning of an infection. Because you ran the risk of having unprotected sex, you automatically put yourself at risk for an STD. This is exactly why the usage of a condom is imperative when induldging in any sexual activity. It could be one of several things, BV, which is bacterial vaginosis or the beginning of a yeast infection, which are both easily treated with medication. It may also be a Urinary Tract Infection, commonly known as a UTI, this infection creates a burning sensation when you pee, your vulva will itch and you may have a discharge that has some odd smell to it. If the discharge is very offensive and has color to it, like yellow or green, you should contact your doctor.