Don't know what happened :-(

Brittany • Mommy to a wonderful 12yr old boy, 9yr old boy 7yr old girl 6yr old girl and 3yr old girl. Due March 11th 2023 with a boy.
Just last week I was producing around 7oz a pump session
Now the last couple of days it's went down significantly 
I'm not even pumping enough for one bottle.  :-(