How soon after birth could i get pregnant again?

ok so i had my son on may 21st. i only bled for 2 weeks after that then stoped. i got a c-section. and i also breast fed until about 2 weeks ago (son got taken away for false accusations). about 2 weeks after i had my son i was haveing sex with my ex, its happened a bit since then. i heard that the next month your supposed to get your period.... i didnt. im kinda afraid i may be pregnant again. advise? help? information on if i could be?