Chances of getting pregnant

So I just had my son a little over 5 weeks ago and me and my boyfriend have been having sex for the past few days. I mean shit I couldn't wait the full six weeks, my appointment if a couple days after Christmas so I'm not on bc yet. How likely am I to get pregnant if we decide to forgo condoms. I'm breastfeeding every 1-3 hours in the day and usually my baby will sleep 4-5 hours at night. I'm just wondering how long did it take you period to return and were you breastfeeding or not.