How to ask your doctor to check for a rare illness?

Danni

I Have extreme itching on my chest arms back sometimes my thighs and random other areas.

I know itching is a normal symptom of pregnancy, but theres no way this is normal!

So I googled it (big mistake I know!) turns out I have a lot of the symptoms for Icp (something to do with bile acid and your liver) it can cause the baby to be still born.

I am taking zofran for my nausea, however nausea is a symptom of icp, so is lack of appetite and not eating - I've lost 20lb since I found out I was pregnant. I'm only 15 weeks and symptoms usually start towards the end of the 2nd trimester however can start as early as 8 weeks.. I'd need a blood test to make sure my bile acid levels are normal but how do I ask for this test? I've never liked going to the doctors and although my midwife is lovely I don't have the courage to bring it up...

How did you ask your midwifes and doctors to do tests on your for unlikely illnesses?