Likelihood of pregnancy

The guy I’m seeing and I had completely unprotected sex. I have been off of my birth control for several months now, and he did not pull out. This happened 3 times. Once on a Friday night, twice on Saturday night. I took a Plan B on Sunday; however, I believe that I have already ovulated this month, and Friday was the last day of my ovulation period (according to this app). The point of Plan B is to stop ovulation, so is there a big chance I can be pregnant? It’s okay if I am, but I just wondering if I should be expecting to take a test soon.

Thanks!