Question regarding pregnancy

So I had unprotected sex on the 15th of this month of July. It was my first time. Just a hook up. I’m not on birth control though and didn’t think of Plan B being out of country. What is the likelihood I could get pregnant? I’m not good at any of this. My last period started July 2nd for 4 days and it tends to be pretty regular. Starting yesterday I’m dizzy a lot. I am super fatigued sleeping all the time. Today I was nauseous from smells with a poor appetite. And I have some cramps on the right side where my female parts are. As well as some back pain there. That all seems too early though, but I’m super sensitive to everything. I mean getting pregnant isn’t easy. You’re fertility is only high so long around ovulation. Like two days before and day of being highest chances. I know nothing about any of this so I thought I’d ask the group for support. I’ve never done it before or close to possible time or felt like this. Obviously too soon to test and have that behind me. Thanks! I don’t have anyone to turn to in my life