When Will Periods Start After Starting Birth Control Pills?

i just started on birth control this past month and i am almost done with the first pack. i take ortho tri cyclen lo. i am on my third non hormone pill. when should i expect my period to come? also on the first day of when started my non hormone pill i had unprotected sex and my boyfriend came inside of me. this was about 6-8hrs before i was expected to take my first non hormone pill. should i be worried?