this is so different for everyone as our bodies react so differently towards breastfeeding.
from my experience, yes you can get pregnant while breastfeeding without having a period.
essentially the less baby feeds, the better your chanses of getting pregnant.
i got pregnant when baby was 7 months. i was breastfeeding and on birthcontrol.
at that stage he was not eating much and i also fed him 6 times during the night as well.
i didnt have a period for 4 months at that stage.