Probably best to get a new test
If the test is positive it is probably accurate but I still suggest getting a new test and trying again. If the test is negative then it can not be considered accurate because your urine was diluted by the toilet water.
I recommend peeing into a cup and then dipping your test into the cup. It is the best way to ensure you have the right amount of urine for the right amount of time to get into the test.