Isn't HELLP Syndrome characterized by fatigue and a high liver enzyme count? I would definitely do some research and ask my OB about it. Here's a link: http://www.americanpregnancy.org/pregnancycomplications/h...
My friend had HELLPs (undiagnosed) in her first pregnancy and it caused her to prematurely deliver (son didn't survive the day). For her second pregnancy, she was constantly monitored and delivered a healthy baby girl.
I don't mean to alarm you my suggesting HELLPs as a possibility. It probably isn't (I think it tends to manifest later in pregnancy), but it's something for you and your OB to discuss if you have the symptoms.