Rhogam no longer contains mercury, but it does contain other preservatives.
Please research this thoroughly before getting the injection.
The risk of sensitization during pregnancy is only decreased from 1.2% to 0.7% with Rhogam. There is a greater decrease postpartum.
Rhogam is a blood product and if you've done any research on how vaccines are developed, safety tested, and approved, you won't feel completely at ease receiving Rhogam even postpartum. However, you need to weigh the risks and benefits and make that decision for yourself.
I got the shot at 28 wks with my first two and really regret it now (I hadn't researched properly). I am skipping it with this pregnancy and may also skip it after the birth, depending on the birth circumstances. I did do a blood draw at 28 wks and I'm not currently sensitized. I am wondering if I can just do another test postpartum and check for sensitization before receiving the Rhogam.
Things to check out-
And of course any threads on Rhogam here on MDC! there is great info to be found.