When did you get your postpartum period?

9 weeks PP and still nothing! Have taken tests all negative! I have had cramping for 2 weeks now no bleeding it spotting at all. My recent test I took was 8 weeks PP and nothing. I am not breastfeeding at all. Didn't recently quit or anything. Has anyone had this and ended up pregnant again? Or is this normal. I'm 9 weeks PP I by far feel as if I should have had it by now.