I jst did the oil change in my car about one month ago n my oil reader isnt even marked at the first dot!!?

 

By oil reader I assume you mean dipstick. Check underneath the car and see if there are any leaks in or around the oil pan. Does the car smoke at all?

 

You'd ideally want to check this by revving the engine and watching the tail pipe to see if any smoke comes out, could be a sign your car is burning the oil. Also when are you checking your oil? It's best to check first thing in the morning when the car is cold on a level surface, this allows all the oil to be drained back into the crankcase. This is all assuming you're sure it isn't leaking anywhere.