Massaging the scalp should boost up the blood circulation and aid therefore hair growth. I can only think that the hair you lost were about to fall out anyway soon... We loose normally about 100 strands everyday. Sometimes less, sometimes more. I've noticed more shedding when stimulating the scalp but I always thought of it being normal.

Have you combed/brushed your hair less after going CG or have you had an updo/protective style for a few days? In this case you would loose the strands all at once you would for have normally lost during this period of time. Sometimes people panic when they loose more hair when they wash their hair after for ex. twists.

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3 a / low porosity / medium texture and density

Two daughters:
3 c / low porosity / fine texture / medium density
4 a / low porosity / fine texture / high density