I swallowed my boyfriends semen last night and he is a heavy heroin user..and i had to take a ua today will that cause my test to come up positive?

Unlikely: It is not likely that swallowing the semen of a heroin user will cause you to have a positive urine test. However, by having a heroin user as a boyfriend you are exposing yourself to many dangers, including HIV. Please reconsider your choice to have relations with a drug abuser. 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. Get HPV vaccine.