ASSLAM U ALYkum
my son is 11 years old.after using the bathroom,one of najas tissue fell out of basket.he did not tell me.after he went to school,i put the tissue in the basket ,washed hands and took bath.when he came back from school,he told me.i a so worried that i might have some najas under my shoe because the place wher tissue was is very very close to the place i entered the bath tub.my shoes were wet at one time.i cleaned the plce wher tissue was on the floor.i am afraid i must have spread najast around the house.problem is i am not certain about any thing being najas but it is possible.plz tell me what to do jazakallah