My period is late.i am cycle day 44.usually had a 30 day menstrual cycle but last period came on cycle day 36. i hav done hpt .all negative .wht t do?

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… Pregnancy is the common cause of a missed period, if sexually active. Home urine pregnancy tests are very accurate 3 weeks after sex.