Plan b questions

Last Thursday I was doing the “deed” and the condom broke and he finished inside me. A little bit over 24 hours later I took a plan b but I had already been ovulating since the night I had sex. I’ve been reading that it may be ineffective since I began ovulating before the pill. Does anyone know if this is true from experience or better research? It would be deeply appreciated to gain assurance from someone else I’m really safe and educated on the subject but not many people around me have much experience when it comes to emergency contraception.