Would a UTI cause 50mg of protein to be in my urine? And I also had 8.7 of protein in my blood? Haven't been eating much due to emotional stress!

No. Utis do not typically cause protein to be found in the urine. After you have finished treatment for the infection, have your rinse rechecked, and if the protein is still present, you should see a nephrologist. Good luck!
Uti. With a UTI you can have protein in the urine, but it can also be due to a vaginal discharge. Your serum protein is normal .No need to worry.