Transplanted hair growth immediately after a HT. Any suggestions?

HT by fue technic 21 days ago 3100 FUs, TH start growing since the first day, currently 0,7cm. I've some shedding from wk2 but 70% of the TH still growing. Is it a good signal of life? healing was fast, never had scabs and the skin redness disappear in 10 days. I though TH don't grow & it should remain in the same length until shedding. Could be possible it isn't real growth & the hair is being slowly ejected? Ive seen TH modifies its position to shed, it lays down to the skin to fall. Thnks