Is the entire hand yellow?
Have you recently started a new diet or herbal supplement?
Do you also have yellow discoloration of the urine? or eyes?
Does your hand or body itch?
If your urine is yellow as well as your hands, you need to consult your doctor.
The yellow color could be due to a simple cause like the increased intake of Vitamin B (I presume you are taking vitamins because of your pregnancy).
But it can also be due to an increase in the level of the enzyme Bilirubin in your blood. In many pregnant women, a form of jaundice called cholestatic jaundice occurs - you need to get a blood test to rule this out.
If your bilirubin level is normal, then the yellow color is due to the vitamin B and you have no cause for worry.
But, please consult your doctor and ask fer the blood test.
I hope this helps.
Let me know if you need more input. If not, please click on the green"Accept" button on this page. A positive rating and adding a bonus will be warmly appreciated.