I had unprotected sex sunday

Patient: I had unprotected sex sunday. He didnt finish but iv e heard of pregnancy to precum. I didnt take a plan b pill and now its fridfriday and ioke up feeling nauseated. And honestly, the top part of my stomach feels hard. Is this mind over matter? I was so nervous because my mom is taking me to the gyno for an annual tomorrow. Could that be why im feeling sick? Im so scared. Im not due for another 2 weeks but i have bloody discharge. Help???