I am 13 days late for my cycle i have taken 3 hpt and a blood test i have symptoms of pregnancy but all test come back negative can a antibiotic alter?

See below: All of your statement may not have come through. However, if properly done pregnancy tests are negative at 13 days after a missed period, you not likely to be pregnant. If you continue to have doubts, you may ask your doctor to do an ultrasound examination. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. 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, if you have sex.