The likelyhood is that it's just one of those things.
However, there are a few things it could be which would need testing for, as if positive it would mean you'd need monitoring a bit more. Firstly, early itching can be indicative of a twin pregnancy.
Secondly : Don't Google. That way madness lies.
I had the all over itching in my first pregnancy. First gp said either eczema or scabies. Treated for scabies (even though I had no other symptoms) and when I was still taking ice cold baths at 3am to stop the itching, I went to another gp.
Simple blood test later and my liver had decided it didn't like me being pregnant and so was playing up. It's called Obstetric Choleostasis (my spelling is probably wrong)
I had to have my liver function checked every few weeks to make sure it wasn't rising too much as if it did, it could affect baby.
Everything was fine. Healthy baby delivered.
See a gp asap to rule it out.