can you get pregnant if you took Plan b the day you ovulated?

lexii
I had unprotected sex May 5th around 9pm so I took a plan b the next day at night around 11pm (May 6th ) but without knowing I found out I was in my fertile window at my highest peak. I ALSO saw that I was suppose to ovulate that same day (May 6th) when I took the pill , could I be pregnant? If so, how soon do I get symptoms of Implantation?