plan b help

deet
Hi everyone, I had sex with my boyfriend september 18th- the condom broke and he came inside me. Immediately we went to the drug store and i took plan b around 30 minutes after. we only use condoms ive never been on birth control. according to my app, my ovulation day wAs september 16th- making me fertile around the time we had unprotected sex. i know i took plan b in the appropriate time- but im worried about the whole thing since i was ovulating. if anyone knows anything about this or if you were in a similar situation please help