Brian and his buddies (and the entire GOP) are all being intentionally dishonest with the terminology and realities here.
Forcing a woman to "wait" until a complication becomes life-threatening is a non-starter, particularly for women who already have other kids to take care of and to not want to take on unnecessary risks.
A fetus can be completely "normal" and "healthy", yet be doomed to becoming a miscarriage.
It is due to a handful of potential issues:
Placental Insufficiency: Placenta is too small and results in pregnancy complications and can kill an otherwise normal fetus as it grows. Sometimes, these CAN be carried to term, but risks are high. In more several PI cases, the "normal" fetus is pretty much doomed, and early intervention is the BEST option to prevent complications. That should be the choice of the WOMAN, NOT the GOVERNMENT. If she has 1 or 2 other kids to take care of, she may prefer to abort and not risk the potential for serious complications, because they can happen quickly, and they can kill her quickly if she does not live where an intervention is an option.
PI occurs in about 10% of all pregnancies, and it NOT ALWAYS fatal to the fetus, but can be. It can also result in severe developmental disorders later in pregnancy. When PI is not too severe, women may want to carry to term; others may not want to take the risks of leaving existing children 'orphans'.
Placental Abnormalities: These are developmental problems with the placenta, not the fetus. And they will eventually result in miscarriage. Any woman SHOULD have the option to terminate immediately if these abnormalities are likely to result in complications. She should be able to do so BEFORE those complications occur.
Various types of PAs occur in ~1% of pregnancies.
Any hospital that delivers babies needs to have staff who can perform abortions in these particular types of cases. Because they are routinely medically necessary to PREVENT serious complications that can result in death, or in an inability to conceive again. Those are risks that should be entirely the purvey of the patient; NOT the state.