Std or yeast infection?

Patient: I had rough sex 3, 4 days ago. i dried up a few times during that. since two days i have been experiencing very itchy and dry vagina, also there is very watery whitish discharge after a while. it does not smell. there is redness and a cut on my labia. could this be a yeast infection? or std?

Symptoms: itchy, dry, vagina