Hi r any of u ladys rh neg. And have to have the shot at 28 weeks this is myy so cond baby so this makes twice iv had the rh stuff but I still dont understand what means I was wounder if any of you could exsplan it a lil I tried to google it but the wanna use all these long dr words I dont . Understand so if u have time and know about it could u plz exsplan some thanks