Could I be pregnant?!

So this guy and I spontaneously decided to have sex, it was extremely irresponsible but we didn't use a condom and he said he could pull out, he pulled out almost all the way before he came and it just seeped right out of me but do you think some could've travelled up? And I didn't use a plan B pill, I didn't think about it until today and it's been a couple days. If there's a possibility of pregnancy, when should I take a test?