Clear discharge from breast?

Ne

My left breast has been feeling heavy all day so I tried hand expressing - clear liquid is coming out from that nipple. I'm getting milk from my right nipple.

I stopped breastfeeding my son early May, and am around 5 weeks pregnant now. Any idea why I'm getting clear liquid?

(I would normally Google, but my toddler is fussy right now and I don't know if I can get searching for a bit. 😅)