Getting pregnant so soon after delivery is not highly likely because ovulation is suppressed in the first months after delivery due to the presence of particular hormones in the system (produced naturally by the body for breastfeeding). The menstrual "periods" a woman may experience during those first few months after delivering a child, in fact, are not a real periods and can be very irregular. Women who give birth require several months to re-establish their full fertilization ability. That period is longer in women who breastfeed. Nonetheless, you can take a pregnancy test to be sure that you are or aren't pregnant.