First pp period or...?

Well I just had my second baby on 8/31. My SO and I have had sex twice since then, most recently was last week Wednesday....we were dumb about things and just used the pullout method and my SO wasn't confident that he pulled out in time...I know I know it was stupid. Anyway I've had some pink spotting today and am not sure if it's my first postpartum period or god forbid implantation bleeding. I'm breastfeeding so I was hoping that would have kept af away for a while but I know that's not the case with every woman. I've also been feeling pretty crazy moody...but that could just be normal for only being 6.5 weeks postpartum and bipolar lol Any thoughts on my situation or any similar experiences?