Does Plan B work during Ovulation??

My boyfriend and I had unprotected sex for about 10 seconds, probably less than that. He didn’t even reach my cervix, and was like halfway in. He masturbated the night before and peed before we did anything meaning probably he got rid of most of the existing semen from then. This happened yesterday and I ovulate today. Should I worry and take Plan B just in case? Or should I have nothing to worry about ? If I should take Plan B, will it even work if i’m Ovulating??