4 weeks PP and just got my period.

Cool.

Least I know why I have been feeling so irritable all week.

That's one thing i'm NOT looking forward to after this baby!  

My son had latching issues since he was 4 weeks early, so I pump and supplement with formula. Breast milk during the day, formula at night. I didn't expect my period to be gone that long since I supplement, but I didn't expect it back so soon.

Same here, I EBF and still got my period back at 5 weeks pp. and I bled lochia til 4 weeks. Too much smurfing bleeding!

My lochia stopped like 3-4 days ago. So, yes, too much bleeding.