Vaginal discomfort, Could it just be a UTI or yeast?

Hi, I was wondering if anyone had some answers about what I'm experiencing now.
So I had sex for the first time in about 6 months a few weeks ago. We used a condom, but then had sex again afterward without one. He pulled out before he came, but I am 100% aware that that is not always effective in preventing pregnancy, it was just a stupid mistake.
About 2 weeks after it happened I started having some vaginal discomfort. I don't notice anything that looks weird, but there is more of an odor and I feel like it constantly itches a little. It isn't like it burns when I pee, but it's just uncomfortable in general.
My period is supposed to come this weekend. If it doesn't, should I take a pregnancy test?
I am not 100% sure that my partner didn't have an STD. If I get tested and something's wrong, I will talk to him about this.
So what does everyone think? I'm trying not to worry too much, but I want to rule out the idea of pregnancy and STDs if possible. Could it just be a UTI or yeast infection??

Thank you.