Hi thanks for your question.
Once you miss a dose of OCP
that is oral contraceptive pills
you have no longer any protection against pregnancy
. Since you had unprotected sex during this period chances are, that you may have conceived and these symptoms could be due to pregnancy. Wait for your next due periods if your periods are delayed by more than a week, get pregnancy test done to rule out /confirm pregnancy. Further course of action can be decided depending upon the result of pregnancy test.
Hope this answers your question