Due my period on the 1-04-16 but thought i was starting on the 31-03-16 but i've had nothing husband had a vasectomy so what else can course me 2 stop?

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 doctor is a good idea if symptoms are recurring or worrisome. If worried about pregnancy, one can do a home urine test 3 weeks after sex.