Well, I'm not qualified to give you legal advice, and don't know the laws in Mississippi, but I'm pretty sure it won't be a problem. It will be a hassle though, because the hospital doesn't know what to do with a new mom that hasn't given birth in the hospital, and the lab isn't use to walk ins for something like that. If you can get a doctor or midwife who will give it to you in their office (or home) you will be much happier. If you are military you may be able to see someone for a prenatal or 2 and talk to them about doing the rogham after the baby is born. Even better is to find a midwife that is willing to give you the shot after baby is born.