Baby poop and breastfeeding?

Ye

My baby will be 3 weeks tomorrow and for the past week, she goes pretty much all day without pooping and right before bed time, she poops but it doesn't seem normal. It completely fills the whole diaper and its consistency has been the same.

Is this normal??

Another problem we are having is I breastfeed her, but have been giving her my milk from a bottle that I've pumped since last night because my milk has only been 2oz in each breast when it's usually 3....so I'm just making sure she gets enough. I also have a tonnnnn of milk frozen in our freezer from when she was a week old, does that have anything to do with this? For the fact that it's packed with more nutritional value?

We have an appt on Tuesday so until then this is the plan. Are these things normal? When is it the right time to give more ounces???