I'm rhesus negative I had 1 anti d injection I think at 28 weeks but never got the second injection as I had my twins 11 weeks early. I didn't get a second injection after the birth as twins were both negative! I have just found out that I am pregnant again. Will my body attack this pregnancy as I only had 1 injection? Do I wait until 28 weeks again? I'm only 5 weeks and got another 3 weeks until I see mw. Can anyone help advise me?