Thick creamy discharge and there's a chance cum went in?

I'm 5 days late. I have very creamy white discharge. I just had unprotected sex and he pulled out, but some of the cum went on my thigh and IDK if it went in my pussy. He had to stroke himself once before he came on my stomach, so IDK if any went in. Should I take plan B? What are my chances?

EDIT: At the time I had unprotected sex, I was already five days late.