Can you get pregnant from a sex toy the might have had semen on it previous days before you used it?

Very unlikely: What you described is very highly unlikely to result in pregnancy. However, it could transmit venereal disease. 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.