I'm reading back and remembered I lost a post that was quite important; the defence pathologist said he believes Reeva voided her bladder very shortly before her death....so that could mean she had just gone to the toilet, as OP says.
I took it to mean that that was as a result of what people naturally do upon death, not that she had actually been to the loo? If she'd been to the loo, and there was no urine found in the toilet bowl, then she would've already have flushed by the time OP came in all guns blazing .. and he would've heard the loo flush. We've heard nothing yet to say that the urine was found in the toilet bowl, and that she hadn't flushed .. so I can only assume that when they say she voided her bladder, that was either through fear (that is actually natural 'fight or flight' reponse, emptying bladder/bowels*) or immediately upon death, as that is a natural bodily function too.
*your body expels any additional weight it is carrying in order to allow you to escape your threat more quickly