Itching is very common in pregnancy and often occurs around the breasts and belly; it is related to skin stretching and hormone changes. Pruritic Urticarial Papules and Plaques of Pregnancy (PUPPS) is a skin disorder unique to pregnancy. It starts as small itchy, red bumps around stretch marks that become larger patches that spread over the entire body. Antihistamines and high dose steroid creams can provide relief. I have seen this resolve during pregnancy but often it goes away only after the birth of your child.
There are no miracle cures for stretch marks as they are typically hereditary but keeping your stomach well moisturized may alleviate some of the symptoms.