Ah okay, that makes more sense about 18 months between deliveries. With AMA a factor, if you were going to try again, I would think you'd want to do so sooner than later. Not only for genetics but fertility and everything too.
Placenta accreta, from what I understand, is when the placenta starts growing next to or in severe cases even through a previous scar. It's hard to see prenatally, there's not much they can do to "treat" it, and it can be very life threatening for mom and baby. So I definitely understand why it freaks ob's and MFM's out. But for it to even be a risk, your placenta has to grow on the same side of the scars. If the placenta is 'above' the uterus, for example, then there's not really any risk. Placentas can move a bit but they don't generally switch sides or entire locations, etc., at least from my very basic and general understanding. With my vertical incision, one of the MFM's I consulted with was more concerned about accreta than pre-e even and told me I'd probably spend my pregnancy on bedrest because of that. The other MFM wasn't concerned about accreta at all. And sure enough, by about 10 weeks, they were able to determine my placenta was in a great location not near the scar so that risk was ruled out pretty early on. On the flipside, I think we had a poster who did have a little bit of concern with it--Ashley (Ruby608 http://preeclampsia.org/forum/viewtopic.php?f=17&t=40008
) They were a little concerned about it for awhile but her placenta moved away or they were able to determine it was okay, and she had a healthy baby and her pregnancy was fine. So anyway, it *can* be a big deal, or it can be a moot point. I'm not sure that the risk of accreta would deter me from another pregnancy, although when they happen, it sounds very risky and scary, so you would want them watching for it early.
Me (29) DH (30)
#1-Olivia Caetlyn-9-28-09-9-28-09, 23+2 wks, emergency classic c-section, class I HELLP, IUGR
#2- Lucas Oliver (rainbow baby)- April 2011, 36+2 wks, HELLP and pre-e free! (lovenox and LDA pregnancy)
#3-Matthew, late October 2012...mostly normal, 37 wks, (lovenox and LDA again)
My blog: http://www.butterflies-and-rainbows.blogspot.com/