Although most doctors recommend getting RhoGAM shots at 28 weeks gestation, you can still receive them later. Some pregnant women report not getting their shots until 30-32 weeks, and their babies were born healthy. But, you shouldn't delay nor skip your RhoGAM shot once your doctor recommends you to get one immediately. There are still small chances that you'll be sensitized before giving birth. Once you're sensitized, there's no point in getting a RhoGAM shot because it won't be effective anymore.