No missed period but faint positive pregnancy test in August but blood hcg level is <0.100 could I be pregnant? Even tho the hcg level is 0.100?

No. If you did not have sex since your last period, you are not pregnant.
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.
Get HPV vaccine.