I had unprotected sex jan 4th and took plan b the very next day, also was recommended to start nuvaring that wednesday the 7th.My last period ended on jan 1st. I also had unprotected sex tues the 13th and again on the 25th sunday both of these were with the nuvaring inserted. i am now on the 2nd day of the week where the ring is suppose to be out and i have yet to start my period. can the ring or plan b be delaying my period? or should i let more time pass before worrying.