I started light bleeding a couple days ago. after having sexual intercourse yesterday the bleeding is heavier with clots. 1 week before period starts?

Postcoital bleed: Can be for a variety of reasons from physiological due to trauma or ectropion or could represent other pelvic issues (infection etc). Difficult to give specifics without an examination. Best to see a doctor licensed in your area for examination and/or consideration of testing. Here is some general information to read/consider: https://patient.info/health/vaginal-discharge-and-vaginal-bleeding

May be early period: You may just be having your period early. 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.