Had cramps for days and late on my period took a pregnancy test and its negative?

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 (like birth control pills), hormonal imbalances, etc… Seeing a Dr. is a good idea if symptoms are persistent, recurring or worrisome. Pregnancy means no more normal periods, so one can retest in 1 wk if worried.