Urinalisys came out with blood trace microscopic and negative for chemical, what could that means?

Depends on details: That just means maybe some red blood cells were seen in the urine. The patient then has to recheck with her doctor to decide if there were or were not blood cells there. Sometimes trace blood is from vaginal bleeding. Usually, repeating the urine test a couple of times on days when there is no vaginal bleeding should show urine without red blood cells. One's doctor can follow up.