Hi, I Gave My Boyfriend Unprotected Oral Sex Yesterday And

Hi, I gave my boyfriend unprotected oral sex yesterday and now I have a slight fever and sore throat. We have been each other's only partners, but we have not been checked for any STI and STD. This isn't the first time that my throat has been sore afterwards, and I I am wondering if this could be considered common or if it may be something serious.