I have chronic hives prior to pregnancy. Chlorpheniramine is the first choice as an antihistamine to help with hives. If it doesn’t work for you, like how to doesn’t for me, Cetirizine is safe during pregnancy too.
If you dont want to take medication, you can use suu balm moisturizer which has menthol that will relieve itch. However, this is a very short term solution. The hives might come back.
Lim Bee Peng