But if it was just a fender bender, and while exchanging info she went into labor then changer her mind about becoming the mother she could choke out the baby to terminate the "pregnancy" lawfully? Fuck this is confusing! 
Are you even partway serious?
Teminations are only normally performed in the first trimester, so chances of going into labor are almost zero (given the foetus is under 12weeks old)
Chances of it survival if bornsix months premature, even less, so there is no need to choke it out, its DOA prety much.
Also, what part of choking a new born to death is lawful in any part of the world?
Hope this clarifies the confusion.