Why do people claim that fetuses are not alive, even though they have a heartbeat?

A fetus heart usually begins to beat at 21 days (3 weeks) after conception.

https://www.justthefacts.org/get-the-facts/babys-heartbeat/

Here's a sample timeline:

Day 1: Conception occurs.

Day 14: The expected first day of menstruation.

Day 17: The woman starts to worry because she's late.

Day 18: Woman takes early pregnancy test. Test is positive.

Day 21: Woman's first doctor's appointment. Pregnancy confirmed.

Day 22: After thinking about her options, the woman decides to have an abortion.

Yes, this is just a scenario that I made up. This "schedule" isn't exactly the same for everyone. But if anything, things usually go even slower than this. Some women take longer to actually take the pregnancy test, doctor's appointments can take longer than this to schedule, etc.

But I'm just trying to show how quickly things move after conception and how more than likely, by the time a woman even knows she's pregnant, the baby's heart has already started beating. I don't understand how it can be denied that something is alive, especially after there is a heartbeat.
Why do people claim that fetuses are not alive, even though they have a heartbeat?
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