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rh negative shot at 26 weeks nicole_2016 Due September 25 (twins); United States 4 posts
May 7th '16

does anybody know what the rh negative shot does 

mrs.white8389 TTC since Jan 2016; 2 kids; 1 angel baby; Florida 2642 posts
May 7th '16
Vanessa K Due September 18 (girl); 1 child; 1 angel baby; Rapid city, SD, United States 183 posts
May 7th '16

It's to prevent your body from attacking the baby if you are rh- and the baby could be rh+. 

Basically if mom is rh- and dad is rh+, the baby could potentially be rh+ as well. Because moms body has never produced the rh+ enzyme, the immune system will treat it like any bacteria or virus and fight against it. The rhogram(?) Shot is supposed to prevent mom's body from doing this and fighting against the baby.