Go back to your Dr and they should narrow things down by running some simple bloods and urine tests.
Also are you drinking enough water (kidney/liver) and do you generally have regular periods?
I'm 12 weeks preg and when I first went to the doctor and had a blood test, it was neg. 8 days later and still no period. Then I got two positive home preg test and finally a positive blood test. Sometimes your hormone levels can be too low in early preg but should show a result a week later. Goodluck.
Do you have regular cycles? Regular as in the same # of days per cycle, not 28 days each cycle. It's normal to have a wacky long or short cycle once in a while.
I don't know any thing about your other question though with your liver, sorry!