This time? Contact the support, they will give your road a flat spot. However, it’s a good wake-up call that situations like these will happen from time to time and you need good tools to handle them.
Faling the data might be not productive in the long run, because definition of “really couldn’t” slowly creeps from “I’m legit dying” to “I’m sick” to “I’m not feeling well” to “I don’t have energy” to “I don’t want to do it right now” or what have you.
You should draw the line very clearly and commit not to second-guess it until <insert goal re-evaluation date which you put down now and don’t second-guess it either>.
I’d also recommend splitting the goal into 2 levels. One - something extremely basic and simple that you will do every day you are physically capable of getting out of bed, even if you are hangover, on vacation and your leg is broken (not kidding here). Second level is your actual sport goal - which you can flunk out of if you have fever / doctor’s note saying to rest / if during the exercise you feel that finishing it is unsafe. Of course, your standardas may vary, but beware of standards creep and draw the line using markers as objective as you can.
You can afford to lose some flexibility here in exchange for a tool impervious to your tendency to slack off.
Splitting the goal into 2 levels makes sure that you are neither too harsh on yourself nor too soft. Also, basic part would become a habit, which is good because continuing a workout is usually easier than starting one. For the same reason I say drop the exercise if you feel it’s unsafe during the exercise, not before - person in running outfit that gets outside, runs a hundred meters or so and feels he shouldn’t go running today is way better evidence than the same person under the blanket feeling that he doesn’t feel like he should go running today. I trust the former one, but the latter one looks suspicious.
Of course, you can use more levels but that gets really complicated very fast.