Thanks everyone

Jodi - My DD is almost 9, and I only had the shot AFTER the birth. It was not required during pregnancy back then Thats why I'm a little unsure of why it has changed now.

Thanks Michelle! DP will be getting a blood test to confirm. I was reading last night online it is not really necessary during pregnancy unless there is a *risk* the bloods can mix. I was told however if i do have bleeding to go immediately to the hospital to have the shot.

The Anti-D shot is only effective within 72 hours of maternal-fetal blood mixing. So even if the injection is given at 28 weeks, it will only help if maternal and fetal blood has mixed 72 hours or less before the injection. The Rhogam manufacturer states that an injection every 12 weeks will maintain a "passive immunity," meaning that theoretically a shot every twelve weeks will protect you in the event of trauma causing your and your baby's blood to mix. They still recommend a new shot at the time of blood mixing if >15mL of exposure has occurred.
The above quote says to me even if you have the shot if the blood does not somehow get mixed within the 72 hours of the shot it is pointless until after birth (or when something does occur to make the bloods mix) - Am i right?

If you would like the link please let me know (not sure if i can post the link here)

Im still not satisfied that I absolutely must have the shot during pregnancy. Of course unless it was absolutely required thats different.

I'm off to read more on it (and the links thank you ladies )

Fingers crossed DP is a -ve group! LOL