Yes, a killer can be charged with double murder for killing a pregnant woman. I'm fine with that in pre-meditated, first degree murder cases. I feel less comfortable when it's double charges related to an accident (as an example, a driver was reckless, but didn't set out with a purpose to kill people)
https://en.wikipedia.org/wiki/Unborn_Victims_of_Violence_Act
Note, it specifically excludes abortion.
Honestly "causing the loss of a foetus" offences are a different axis of law and attempts to confuse the abortion issue using them are pretty disingenuous.
They can be, and at best are, constructed with focus on the harms to the person who has lost the foetus, rather than constituting an independent crime of assault or homicide against an unborn victim (the unborn being traditionally excluded as valid victims of such offences under the born alive rule).