These are the whisperings of the shaytan. Ignore them and when you use the toilet before taking wudhu, just sprinkle water in your underwear, so when these thoughts come up, you would know that this is the water.

When I will be praying I feel I has pass few 1 drop of urine this happens once after I urinate then I make wudu while standing for my salah ,so should I have to continue or I must perform wudu again so like wise I can keep the same wudu till my next salah like from dohor till asr?