am I ok?

I took Plan B after having unprotected sex just incase. Now, he did not cum inside of me but I was worried that's why I took it. Am I fine could someone please calm me down? But will my period come normal? Or is there a quicker way for me to get my period can I eat something? Please help! Also my tummy hurts a little not sure if they are cramps or what I am on an antibiotic for a cold.