My period is 6 days late. my breasts are sore. i sometimes experience cramps. today i had light brown spotting. my period has still not started. what could it be?

Some thoughts...: Pregnancy is a common cause of a missed period. If not pregnant, other reasons for a late or missed period include: a random occurrence, excessive weight loss or gain, increased exercising, emotional stress, having an illness, traveling, medicines (such as birth control pills), hormonal disorders, etc… A visit to one’s doctor is a good idea if symptoms are persistent, recurring, or worrisome.