Had safe sex protected with condom, less sleep, stressed week(exams) 3 days fever.pregnancy test made at the right date: negative.delayed period. why?

Some thoughts...: In a woman with regular periods, some causes of a late period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (such as hormone pills), hormonal imbalances, etc… Seeing a doctor is a good idea if symptoms are persistent, recurring, or worrisome. If having sex, a home pregnancy test can be done 3 weeks after sex.