When I visit the bathroom, I do my business and do istibraa with my right arm however I don’t think that istibra is doing anything and there is always one drop that comes out 5 minutes or longer after I have stood up.

I can’t determine the colour of the drop and it always one drop that comes out after that I have stood up. I'm not sure it is urine and i can’t determine the colour of it. But it drops after every toilet visit.

Can I assume that the drops that come out after that I have done istibra are pure? Because I keep overthinking it and this issue is ruining my life