First of all you shouldn’t have sex the first 6weeks after you gave birth or intil your stop bleeding, and you need to use a condom during the first few months so you don’t get a infection!!! If you are breastfeeding it can be another 5months before you get your period, so you can’t tell when you ovulate. Every girl is different but you can get pregnant before you get your period, because you ovulate a week or so before. You need to take care of your body and talk to your doctor before doing that. You have a baby to think about now so you shouldn’t put your self at resk that may stop you from being able to take care of your little one. Becareful and you should talk to your doctor.