Am I screwed??

I had sex the entire time while I was in my fertile window and on the day I ovulated (according to the app at least, I’m not exactly sure when I do) without a condom BUT he pulled out each time. A few days after, we did it again and he didn’t pull out. Im not on birth control so I’m super scared and paranoid. I was supposed to get my period today and I never did. I’m very regular.

I got so paranoid that I took an early response test yesterday morning. It came out negative. However, my friends are telling me that there’s still a chance I could be pregnant. How worried should I be? Based on your educated guesses, do you all think I am or not? I really have no clue at this point. All I know is I’m scared.