Re: Can I do anything to increase my supply during pregnancy?
I nursed through two pregnancies but my nurslings were much older and not getting most of their caloric needs via milk -- there were 17 months old and 3 years old. They didn't seem to care there wasn't much milk, they nursed anyway.
I don't know what you can do to increase your supply as your body is going back to the pregnant phase, not the nursing phase. Your body works to meet the needs of the baby inside of you first. I would be cautious about taking supplements unless you have checked out if they are okay to take while pregnant (I know fenugreek and blessed thistle are contraindicated for pregnancy, not sure about anything else).
Many moms who have younger nurslings find they will have to supplement with formula during pregnancy.