Should I be retested for STD’s??

I was recently treated for a yeast infection a few weeks ago and tested negative for other STD’s. However, I have been performing quite a bit of oral on my boyfriend and noticed I have a sore throat and a sore/ulcer on the side of my mouth (which I noticed was a symptom of possible STI from oral). I wasn’t sure if this was just me catching a cold or something. I also initially thought I got the sore because I have a habit of biting the side of my cheek. The sore has gone down and is not painful anymore. I still have some slight itchiness in my throat. Do you believe I should be retested for STI’s?