I'm only 9 weeks but I have been using Palmers Cocoa Butter in my breasts, stomach (especially lower stomach), hips and thighs and bum since I found out I was pregnant. It is supposed to prevent stretch marks but I've read that nothing will stop you from getting stretch marks if your genetically prone to getting them.

Also, it could just be the time of year too. The air tends to be drier which can cause the skin to itch. The cocoa butter is a little on the expensive side but I'm sure sorbolene will stop the itching (or at least reduce it). You can also use sorbolene instead of soap in the shower too which might also prevent your skin from drying out. When your finished your shower, slop yourslef up with sorbolene while the skin is still warm and wet and pat dry.