I do that. Some days he will feed twice or I'll pump. He mostly gets formula right now because my milk supply is low. You just have to tell your boobs your kid needs milk by either pumping every few hours or having your child try to nurse every few hours
It says you're pregnant...how is your supply disappearing? The best way to build supply is nipple stimulation. I'd consult your local lactation specialist.
you can but you won't be able to produce milk if you don't do it more often 😊I hope this helps cause I tried it after words in a month I had no milk to give