worried about pregnancy

so me and my bf had raw sex and he pulled out before he came but i’m still worried about pre cum and actual cum incase we didn’t see anything. he sweared to me there was nothing when he pulled out and then he came but it still worries me a little. around 30-45 minutes later i took the Plan B pill. it’s supposed to be 95-96% effective especially if you take it sooner it is more effective. i know it’s very early for any signs but it’s still a worry and i wanted to see what you thought and if you was in this situation would you be worried