hi i would say it could be the change night work is the pits for our body but do think back been having any unprotected sex of late even you guy pulling out before ejaculation could do it and not all women get the effects of pregnancy. so get a test done see what's happening if its negative just put it down to the change of life style and perhaps a bit of stress stress will also do it. do hope this helps you. good luck
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?