What Causes Vaginal Discharge And Redness In Vaginal Area?

I ve had sex with a new partner, we used condoms. However he did perform oral on me unprotected. We only had sex one time. And was my first time in about 7 months and I ve been to the doctor prior to us having sex and i was clean. Don t know about him. But every since we had sex that one time I ve been irritated on and off through out the day, everyday. It looks to be little red down there. I wear panty liners because i have some maybe off whitish discharge on and off. I was wondering since it was protected did it come from oral? Or could it be my ph balance off? Because that seems to happen to me little too often than i d like...i will be going to the doctor asap.