Miss period on depo

Damien

So i just started depo on october 10th, and according Glow and Flo, i shouldve gotten my period on the 16th. Its now the 22, and nothing. Im 98.99% sure its just the shot...doing what it does? But i figured id get my period this month because i began ovulation on the 1st. Is this normal? Ive only gotten one shot