Plan b 12/8, period & nuvaring in 12/15, nr out 12/26, unprotected/no pulling out sex all thru jan. no period yet. what are the odds of pregnancy?

Hard to predict...: Can buy a home pregnancy test. The urine pregnancy test done correctly will give a reliable result 3 weeks after sex (or when conception might have happened) or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and therefore lead to a repeat test.