What Causes Vaginal Itching After Unprotected Intercourse?

Hello! I had sex for the first time 7 days ago. I did it two times with my partner, one with a condom and then one without. (Though I am pretty sure that it is not an STD since he hasn t had multiple partners, but I guess there is a chance but I doubt it!) Anyways, 6 days later I got an itch in my vagina (vulva I think) and it s not severe but it is unpleasant every so often. And now it s the seventh day and it is still present. Could it be a bacterial infection or am I just overthinking it? Please help asap!