Yes, QUICKENING is a Scrabble word!

Letter values in Scrabble US: Q 10, U 1, I 1, C 3, K 5, E 1, N 1, I 1, N 1, G 2.

Is it a valid word?

QUICKENING is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

the process of showing signs of life
the stage of pregnancy at which the mother first feels the movements of the fetus
the act of accelerating; increasing the speed

Also: speed up.