I understand your concern.
In my opinion the itching during pregnancy
can be physiological or abnormal.
Usually itching is present in pregnancy in 3rd trimester ie between 29-40 weeks.
But it might not be associated with raised serum bilirubin
and liver enzymes.
Other condition called obstertric cholestasis
of pregnancy (OCP) where there is severe itching
and jaundice associated with raised liver enzymes and serum bilirubin.
I suggest you to get serum bilirubin done to check for any OCP.
OCP might be associated with preterm labor
With good monitoring the complications can be prevented.
Antihistamines might give you relief.
If raised bilirubin is present other medicines to decrease the bilirubin might be prescribed.
Hope this helps.