Mini pill while breastfeeding


So I just finished taking my first week of the mini pill and im bleeding like I got my period.... im 6 weeks PP but shouldn't I get my period after being on the pill for 3 weeks?? Or does the mini pill work differently than the regular pill?? I haven't skipped any pills and im taking them at the exact same time everyday. Or could this be PP bleeding still?? My bleeding stopped at 2 weeks PP. Im so confused lol.