EBF - amount

Hi, I think i have ppd and going through reading some posts i was wondering if anyone else noticed if their milk production went down?  my LO is 11 weeks and my ppd just started in the last couple weeks.  I noticed my milk production has coincided with that.  Before i was pumping around 6oz in 10 min.  now i can only get 3-4 oz.  Anybody else notice the same thing?