You can't get the rubella shot when you're pregnant. They will prob give it to you just after birth. At least it's not a common disease. I've never had it, nor really know anyone who's had german measles.
Good luck and try not to stress. My sister is not immune to chickenpox and is currently pregnant. She has a 2 year old son, and it's going around kindy. It sux, but there's not much you can do except be careful. xo