I don't know the legal definition of manslaughter.
I suppose if the woman purposefully did something to cause the miscarriage, then maybe.
But we are talking about abortion.
Where a pregnant woman goes and actively seeks out someone to kill her otherwise viable unborn child.
Not even remotely in the same ballpark as a miscarriage.
This is a very weak ploy.
NC does not define manslaughter statutorily so they use the common law definition:
the unintentional killing of a human being without malice resulting from (2):
1. the commission of an unlawful act that is not a felony.
OR
2. an act done in an unlawful or culpable negligent way, if death was a foreseeable outcome.
But, deaths are investigated. Consequently, advocating that the death of an unborn child is a potential murder/manslaughter would mean that police should investigate the death of murder/manslaughter. Similarly, if a family member died and I tossed the body in the garbage or flushed them down the toilet, I could be charged with a number of other crimes i.e. corpse abuse, destruction of evidence, and hindering a police investigations.
While I thoroughly enjoy the legal implications of treating an unborn fetus as a "life," I also like to contemplate the moral ramifications.
If you had a friend that had a medical abortion, would you remain their friend?
If you had a friend who drowned their six year old in the tub, would you remain their friend?
I, and most people, note a difference here. Sure you may dislike the fact that someone had an abortion, you may even find their choice morally reprehensible, but is it really on the same level as drowning their six year old?