Hi,
I can't answer your question about the WinRho. But, I do have to ask, why are they telling you, you must get a repeat c-section? Really, I'm surprised at this, in this day and age. There are relatively few exceptions where women can't have a successful VBAC,and it is almost always safer for baby and mom. (And, I apologize if you might be one of those few.) While of course you should prepare for every eventuality, I would think that having a doctor who was supportive of VBAC would be much safer for you (and baby)than a surgical birth.
It's been a number of years since I last gave birth (In fact, my youngest, my twins, turn 11 tomorrow!), but one of the best books ever written on Cesarean prevention and VBACs is "Silent Knife...", a book that should be required reading for every pregnant couple.
You can find it, here. I don't remember it being such an expensive book before, but looks like you can pick up a used copy for $11.97 at Amazon:
www.amazon.com/Silent-Knife-Cesarean-Prevention-Vaginal/dp/0897890272
This authors of this book did exhaustive research on this topic, and it is worth being informed about all of your options.
I just think that having a vaginal birth would uncomplicate a lot of things for you, as well as enhancing the whole experience for your whole family.
May it be a Safe and Blessed Event!
April