Hi there Lkdebeer
Well done on bf so far! A lot of women give up before even reaching 5weeks.
It is difficult if you can't express enough during the day because of time, space etc but you are trying & that is excellent.
Bf works on supply & demand, the more milk that gets taken out, the more it will make & unfortunately your milk supply will adjust according to how you feed & express.
Ways of increasing your milk :
1) Feed on demand whenever your lo is with you & especially weekends - don't work on a schedule
2) Drink lots of water
3) Try to pump over weekends whenever you get a chance. Your supply is usually higher in the mornings
4) The milk that you express can be kept at the back of the fridge for 3-5days & will still be fine. So whatever you express, keep in fridge & give the "oldest" milk first. You can buy freezer bags as well & just mark the date on & freeze it.
5) See if you can maybe work in an extra pump session at night & early morning(I know it's hard).
6) Fenugreek tablets - some mothers claim it works for them
How much does your lo drink during the day, per bottle? Remember to let the caregiver do paced bottle feeding. It will prevent baby from overfeeding & will basically feed the way she feeds on the breast.
Here is a link on it
kellymom.com/bf/pumpingmoms/feeding-tools/bottle-feeding/
My son is almost a year now & still only drinks between 60 - 90mls per feed as a bf baby drinks anything between 60-120mls. Very seldomly will they drink more than 120mls. That is why the teat should always be on the slowest flow & paced bottle feeding.
Bf babies & formula fed babies don't consume the same amount of milk.
Here is another link where you can calculate roughly what your lo needs - this is only a guideline
kellymom.com/bf/pumpingmoms/pumping/milkcalc/
Ask away if you have any more questions & see if you can join the la leche league group on fb. They are absolutely wonderful with all the help and advice that you get
If interested, let me know & I will send you the link