Hairs falling with black bulb, are those hairs related to mpb?

One would need to see all your hairs in a standardized hair collection to answer that for you. Generally if a high proportion of hairs are less than 3 cm with only limited amounts of shedding only, the chance of this MPB goes up. See your doctor to perform a 5 day or 60 second hair collection. 

I can't tell what you are speaking about without seeing it. If you have male pattern balding you will have miniaturized hairs in the area that you are losing hair