Pregnant?!

So i had unprotected sex on the 29th of January and i took plan b the same day, i felt really sick after taking it which i assumed was normal, and around these couple of days is when my period is supposed to hit but for some reason it hasn’t which I’m also assuming is normal but I’ve been having these HORRIBLE cramps like unbearable and a lot of discharge which I’m not sure if that means I’m gonna get my period because it feels like i am or if it’s possible i am pregnant.