Hairfall from back of head (, Donar

Hello I have problem of receading hairline problem from some year but my receading hairline is stop from one year When my hairfall is almost stop I decided to grow long hair and  I grow it upto 7-8 inches And after bathing, I have loses some hairs(15-20 hairs ) only from back of my head (may be from donar area) In which some hairs have black bulb structure at end and some are thin IS THIS NORMAL TO LOOSE SOME HAIRS FROM DONAR AREA ON DAILY BASIS I want to go hair transplant for my receading hairline but I have a doubt, The hair that is falling from my donor area, first is it normal or not and if we get transplanted in the future, will it be servive  or not? Somewhere they will not fall, just like some of my hairs are falling from the donan area. IS THIS NORMAL TO LOOSE SOME HAIRS FROM DONAR AREA ON DAILY BASIS