Me N Mg Boyfriend Had Unprotected Sex 11th Of This

Me n mg boyfriend had unprotected sex 11th of this month.. It was the third day after my periods.so it was supposed to be my unfertile period...however I ate an emergency contraceptive pill the very next morning...its been 6 days..and now m feeling to pee every now and then...and after I pee I feel as if there's something left...what could it be??...22 yrs female