hey bb,
I was completely asleep for my procedure and I'm thankful for that. The events and emotions surrounding the abortion and afterwards were hard enough without being aware of "the moment" itself. You say you're someone who never wanted to experience abortion so maybe being out for it might be a good choice.
Afterwards physically I was mostly fine, some extended bleeding (light bleeding for about 50 days which turned out to be some retained tissue) but mostly fine-- emotionally not so much. I started lactating and without the baby it was devastating. Can you imagine? I know I will never be the same again and that I've introduced enormous amounts of sadness into my life... in short, the guilt and sadness were much worse than I thought they would be... so I wouldn't be so sure you won't experience any negative emotions... you should know to expect some so you won't be blindsided. Everyone here will tell you they went through some kind of process emotionally, some faring better than others, but it is a journey of healing afterwards. Relationships suffer too, and a lot of them end. I would encourage you to seek out more information about what to expect emotionally.
I'm curious to know what the high-risk factors in your previous pregnancies were-- you had the babies and I assume you're all fine? they're there and you're healthy and sexually active... unless your previous experiences were nearly life-threatening or your marriage is crumbling, re-consider. It's just something you cannot ever take back. I also ask because the previous risk factors may also factor into the safety of your abortion-- you probably know, but make sure you tell your doctor all about that.
I don't know the whole situation-- only you do-- but I feel so sorry you're in such a situation... I wish you felt like you could keep it, but it sounds like you really did not want any more children--after you get through this I hope your husband will consider vasectomy or that you consider something permanent. Methods as you know can fail and abortion is just no fun.
I was and still am pro-choice, but it is a deeply flawed system that considers the long-term well-being of the woman least of all.
good luck with everything, if you have more specific questions, just ask.
"We have much courage for the abstract, but not for the concrete."
-Helen Keller