Condom broke

Hey ladies,
I just had sex with a friend of a friend and the condom broke. Im on my last day of fertility, so the chance is 8% high. We also dont know when exactly the condom broke. 
I really really really dont want to take plan b. I dont even take aspirin and i just dont want to do that to my body.
Do you guys think its really necessary on my last day of fertility? Im going on vacation for 2 weeks today and i want yo be calm, but i also dont want to take it. What do i do? Im 21.