Petrolium jelly has been my best friend for itchy boobs!
Your boobs will itch when they grow, so they're likely gearing up knowing that you'll be having baby before too long.
This may sound weird but try Goldbond foot powder/lotion. That stuff works miracles.
I Bought Unscented Lotion And Cocoa/Shea Butter Instant Relief Plus I Have Nipple Rings so The Itch Is Intensified
Try lotion/cocoa butter. If it's your nipples try some lanolin (I like the lanosh brand) people use for when they're breastfeeding and their nipples are sore/cracked by I found it also soothes itchy nipples. Just put breastpads on when you put lanolin on as its thick and can stick to clothes