Am I pregnant 8 weeks after giving birth?

I just had a baby 8 weeks ago and 2 weeks after giving birth I jad sex and still do we use no birthcontrol or condoms and he dont pull out can I be pregnant again? also I bled for 4 weeks after having my 8week old and still havent started my period when do I start it? Please give me advice im only 19 but I am married...