Oo naman, pwede! Injectable contraceptives like Depo-Provera ay safe kahit walang anak pa, marami sa circle ko ang gumamit nun before pa lang sila mag-settle down. Best to talk with your OB though para makita kung ito talaga ang best option para sa'yo, dahil may considerations din like lifestyle at health history, they can guide you properly on which contraceptive works best for your situation.