Debating a race

Somewhat recovering from being sick and I have full 1/2 IM race this week. The harryman triathlon. I was going to use it as a training race for the full distance race. Now I am debating whether it makes sense to toe the line, when I am at 40%. What good can come out of this. I already have my mental 6-pack of being able to run 13 miles with fever, not sure if I need to do 1/2 IM B race while still on antibiotics.
At the end I decided to skip the race and make it a full training day. I am going to 3000 yds in the pool, 70mile bike , 6 mi run. My own triathlon. With the option of skipping out if things get too bad. I race myself today. I race my body, my mind, and the conditions.