**Do not read if you are feeling hormonal, unsolicitated advice to follow

**
So, despite never having been in your particular situation. I figured I would throw out some non-supplemental pumping help (that I am sure you are already doing, so don't virtual slap me

)
*Heat them babies up!! I always pumped more after a hot shower or if that is not an option just use warm wash cloths on your breasts.
*Massaging while pumping and firm compressions while pumping (or even while nursing as well)
*Make sure that your horns are big enough (I don't know if this is an issue for you). It took me a while to realize that my horns were a bit too small and when I sized up I noticed a bit of an increase in production.
*Lube the horns. I used Morgan's Nipple Butter, kept my nipples from going "numb" during a pumping session.
I have a hard time consuming the amount of calories I needed just for me and nursing I couldn't imagine being pg as well. Lactation Cookies helped me alot. They had the benefits of helping with my supply (oatmeal) and getting some quick/easy calories in me. I don't know if you can use the brewers yeast/flax seed that is normally put in it, but it could be beneficial even if not.
Anyway that was my unsolicitated advice for the day
