What type of doctor do i see when i have abnormal bloodwork?

I have an abnormal albumin protein in my bloodwork and since my OB/GYN is not a general doc she doesn't know why that is but says it's serious and needs to be looked at. I have been having loose stools the entire pregnancy as well and am scared my baby isn't getting the right nutrition. What type of doc do I see? she said just see my regular doc but I just moved so I don't have one. I doubt a general doc knows that much about blood levels and causes?