I am 8 weeks pp, almost 9, and I ended my pp bleed at 5 weeks and 2 days after it ended, I got my period. I am even breastfeeding too, which they say it can be a form of birth control too, it's not true for all woman. So it's possible to ovulate that soon. Your very fertile after pregnancy, that's why you can ovulate that soon. Your hormones are all out of wack from pregnancy still.
My baby turned 4wks on Thursday and I'm experiencing the same thing! It's definitely possible to ovulate already. Many women end up pregnant before their 6wk postpartum app.