I'm going 10 days late with my periods, a 40 day cycle rather 30 day.im regular just going late.im a virgin.what could be the reason? am i ovulating?

Some thoughts...: This happens sometimes. 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.