Is It Normal Not To Have Periods After A Single Depo Shot Despite Intercourse Through Withdrawal Method?

HI L HAVE AQUESTION L TOOK A DEPO SHOT LAST YEAR NOVERMBER END AND ONLY HAD SEX ONCE AND HE DIDNT ENJECULATE INSIDE OF ME AND L ONLY TOOK THE DEPO ONCE AND I NEVER BLEED .I ONLY HAD ONE SHOT AND L HAVE NOT GOT MY PERIODS IS THAT NORMAL..DO YOU THINK L AM PREGNENT.