depo provera 150

I am 22 years old.. I started using depo provera for first time on September 26 two days before finishing my period.. my next period was supposed to come today october 21, but the doctor told me I was not gonna get my period for 3 months.. and today I did get my period like I was supposed to.. I had relations for the pass two weeks 7 days after I started using the inyección..