I am 3 weeks delayed and i have brown mucus in my panty for 3 days i have no sex with my bf, he just rubbed and put his penis around my vagina am i pregnant ?

Maybe not, but...: 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... Pregnancy is the common cause of a missed period, if sexually active. One can check a home urine pregnancy test. They are sold in stores everywhere.