Does Plan B fail during ovulation?


Had unprotected sex with my husband on Feb 2 in the morning glow said I was 32% likely to get pregnant on that day. I took plan b that night. My period was due feb 16 but still not here. I’ve been feeling very nauseous in the evenings! HELP!!!! Can plan be fail because I probably ovulate? I also DTD few days before my fertile days started as shown in the pics. Help ladies what do you think ?