Soo :)

I had my baby boy almost 3 months ago. I got my first BC shot (depo) on the 15th (two weeks ago) my boyfriend and I had sex and we didn't use protection and he didn't pull out. I breastfeed as well. Do you think I will get pregnant? I honestly can't tell if I had my period or not because after post partum bleeding it stopped and then I was getting my normal period like cramps and I started to bleed again but it was like old blood. (Sorry tmi) I was just wondering.