Ok I know sex causes pregnancy....but

lacy • Im 20 years old. Baby #2 comming soon
Ok my question is can u get pregnant during your period while on the depo shot ? I already had one kid and it's been 3 months since he was born, I just threw up my dinner for no reason at all, I could have also caught the flu , yes I know there is always a chance to get pg when u have sex but what are the chances during period and depo shot ?