 [ Symptoms ] missed period due to pregnancy or change in schedule  my last period was february 27 and my cycles are usually 37 41 days long my period is almost a week late but i have no pregnancy symptomw i recently started working night shift a week ago so my sleep schedule has been completely reversed from what i read that can affect your period around the time of ovulation i was in a regular schedule not until the day before my period did i change my schedule is my late period more likely to be caused by pregnancy or the dramatic change in my schedule [ Disease ] you should try taking another test even if it was a little bit you could still get pregnant