Should I consider taking a plan B pill

I had unprotected sex on my cycle day 19. According to glow that's past my ovulation. He did NOT cum. We only did it for a couple minutes, about five (more or less). I know we shouldn't have sex without a condom but it dried out and thats why we continued with out one. 
I'm just asking for some advice. I don't know if I should take the pill or hope for the best. Help please. 

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