My period will be 4 weeks late in a few days. im having achy pain in my hips and sides. it comes and goes but its uncomfortable ?

May want to call Dr.: 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 doctor is a good idea if symptoms are persistent, recurring, or worrisome. Pregnancy is a common cause of a missed period, in couples having sex.