Liver test is one thing, good idea mrsconnelly!!
Another is- are you having enough water? Pls aim for 2-3 litres a day!
Im not sure how far along you are but im 36+ weeks and the top of my belly was really itchy and ive been told i have to have a blood test to check my liver.. so mention it to your midwife or doctor and see what they say! Hope it stops itching soon! :)