Tmi sorry for the pic. Could this be an std?

Now I already have an appt with my obgyn next Thursday, but wanted to know if I should call and ask them to give me an std test too?? It itches sometimes. Not sure if it could be an std, or if it's a bad yeast infection? This is giving me all types of anxiety and stress because I've been with the same guy for over 3 years and just got this within the last week or so and it has gotten worse. Again I am already going to my obgyn I just want to know what your opinion is.