In this case the rights of the pregnant woman are being discarded, at the fundamental level of her physical being (self defense against serious trauma and ugly personal assault, even) to accomodate the invalid justifications of a temporary pretense that authoritarian religious fanatics have honestly redefined human embryos and zygotes as persons.
The motives for this odd malice are obvious in the auxiliary commentary these religious fanatics attach to their arguments - women are "other" and lesser than them; the woman is to obey, and sacrifice, and suffer, according to their whims and pretentions. Her exercise of free will and decision is to be curbed according their edicts, even to control over her own body and time. She renounced herself to them by having sex.
The dishonesty of the pretense (personhood is and has been granted to zygotes in no other circumstances, the assignment of personhood is without the normal recognitions of limit and separate identity, etc) is bad enough. The use of that dishonest pretense to justify subjugation of the woman to such perverted and psychologically corrupt political force is worse.
The inability of religious fanatics to recognize their own evil, their own betrayal of their own better nature and human integrity, is one of the major features of religion that we need to keep carefully in mind. There is no limit to the means they will employ, as there would be were they self-aware (and not psychopaths, of course).
You do notice that you misattributed the passage that you quoted?
And you do notice that you didn't read some of my previous posts in this thread?