Is it even possible to be Pregnant?

I just have a baby back in June and after about 6 weeks postpartum I decided to get the Lileta IUD. Since I got it I have had regular periods each month until now. My breast have recently started leaking again (not too bad just a few drops here and there). I read online that I would have a lest than 1% chance of getting pregnant but all my friends are telling me I could be. Any thoughts?