I had a sore throat a few days ago but it eventually went away. After about a day of feeling better, I performed unprotected oral sex on my boyfriend. A day later, the sore throat returned and it was much worse than before. Additionally, I had a canker sore while performing oral sex and I heard that open wounds or sores makes it more likely to transmit an oral STD. It does not hurt when I talk but it hurts when I swallow saliva or drink water. It also severely hurts when I yawn. I shined a flashlight towards the back of my throat and observed some faint white patches. What are the chances of receiving an oral STD from unprotected oral sex? Are the risks more elevated because I had a canker sore?