Period is 20 days late. negative pregnancy test. never missed a period except with my daughter and another miscarriage. could it be wrong?

Missed cycle: Certainly consult your GYN. I would suggest a repeat pregnancy test, pelvic ultrasound, female hormone levels, thyroid function and Hga1c.

Tests are accurate: 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 (such as hormone pills), hormonal imbalances, etc… Seeing a doctor is a good idea if symptoms are persistent or worrisome. If wanting to retest, one can try another brand of urine test and do it next week.