Could I be pregnant on depo-Provera? ?

I got my depo Provera shot for the first time Septemeber 26th and my SO & I had sex without a condom September 23rd 24th 27th & October 1st 4th 5th 8th & 12th multiple times on those days . We'd rather not be pregnant but we wouldn't mind it either . & I was suppose to start my period October 16th & I didn't & I still haven't .