Clean Natural Fire

so i found a fire ant in my room the other night and so u know i killed it..then tonight i went to pick up my dirty cloths and there was like 10 of them..once i removed the clothes they just keep coming and i can't find where they are coming from except from under the walls.and i don't eat in my room and whatever can drinks i had in here were up high and on the opposite end of the room.every know and then i check cus they come 1 and 2 at a time so its not like its hundreds of them coming at once.i just tried cleaning spray called 401 and they seem to stop going to the rea they were in,and i have seen alot less of them,but i don't know for how long.is there any natural way to kill them,and if not kill them keep them out of the house, esp my room..lol...also please give answers about the problem inside and not about taking out the mound,i will check and see if theres on on the side of the house in the morning.also i don't want my parents to find out cus they will flip out.