Hello. I haven't been properly breastfeeding my baby since birth. I ha…

Hello. I haven't been properly breastfeeding my baby since birth. I haven't even pumped for a week now. I want to get lactation going and start feeding him/her. I didn't breastfeed because my nipples were retracted, so I had to feed with flanges. Later on, we removed wisdom teeth, and I had to drink ketoenol due to pain. Now I want to get lactation back on track, is it possible? The baby is used to the nipple and bottle, But when hungry, they take from the flange, but there's not much milk ??‍♀️