Not not conscious at all. Not a person.
There is no real difference in terms of cognitive abilities between a first-trimester, second-trimester, third-trimester, or even a born baby in the first nine to twelve months. Sure, inside the womb the baby is asleep, whereas outside it is awake and screaming, but in terms of memory, thought processes, intelligence, etc. there is no difference at all. It is a purely instinctive creature at this point, which is why we do not have any memories from this period of our lives.
So, if you claim that it's okay to kill unborn babies because human life that isn't conscious yet (but will be in a matter of months) is worthless and " not a person", then you automatically claim that it's also okay to kill babies before their first birthday. Also, patients in a coma are no longer human persons and can be terminated at will, even if there is still a chance they might recover.
Of course, pro-murder zombies operate on (ironically enough) baby-logic, where hiding something from sight (in this case, inside the woman's belly) makes it "not real", whereas taking the same thing outside magically makes it real again. Even though it is no more and no less conscious than it was before.