Please should i take plan B do i have to worry?"

So last night i had a sex with a condom.We did it in a doggy and after he finished i asked him if everything was ok with the condom and he said that he didn’t cum inside me.I asked him where then, and he said that he wanted to cum on my back but he missed and his cum was on the sheets, i saw it it was wet. The app says that it is my ovulation day today and i got paranoid because what if some cum fell into my vagina idk how to explain it.Should i take plan B?