as many comment with opinions

so me an my boyfriend had sex. I'm not on birth control . we stopped before he came . an the condom didn't rip. as I was getting off from being on top the condom slid up a bit. resulted worried us that precum may have slidden down the condom to the base.... if that can happen. I got nervous an didn't want to take any.cjsnces an took plan B within 14-16 hours after. Then read it doesn't work on ovulation week which i was on . am I screwed?