Period 17 days late negative urine pregnancy test by gp, but period is brown, with chocolate coloured clots. why?

See below: If you are sexually active and not using contraceptive it could be spontaneous loss of an early pregnancy. It may also be just a normal variation on your menstrual cycle. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex.