I'm going to flush the toilet
Why are you going to flush the toilet?
There's pee in it and it needs to be flushed.
That's great you want to flush the toilet, because you're not the only one using it. It would be disgusting and inconsiderate to leave your waste laying around, and it's not worth the dirty toilet and a couple cents of saved water by letting it stand.
No, it needs to be flushed because I have a problem with pooping if there's pee already in it.
In that case, don't you think you can just wait until after you are completely finished before you flush? You will probably feel happier when you know that you aren't wasting water for no reason.