freaking out

i had unprotexted sex with my bf but he pulled out and im not sure if any dripped down into my vagina or not. but i wiped around it with a wipe right after he came. but 24 hours later i took plan b just in case. sex was june 12, i took plan b june 13, and i still have not had my period. am i pregnant? 
i have gotten a few cramps since then, ive had plenty of white discharge, and ive been a little emotional (probly from stress), also i have no bled a single drop. 
should i be worried?