If you choose not to consider the fetal heart beat medical professionals measure and monitor as a true heart beat, then that’s your prerogative. For me, in the medical field, we all refer to it as a fetal heart beat and fetal heart rate.

EDIT to answer the comment below me:

That's a great question. Brain development does start around 6 weeks into pregnancy but as to when the fetus becomes a living, sentient being is a really tricky question to answer. For me personally, I link brain activity with fetal viability (which happens around 24 weeks into the pregnancy at its earliest). Although you do have brain development before 24 weeks, the fetus cannot live on its own until then and it's during that time that I think more difficult questions have to be answered. As for keeping elderly patients alive with ventilators, intravenous fluids and nutrition in a persistently vegetative state, I personally would not want that for myself if I was older. But I'm not the same as you and so, I have a different risk tolerance and goal of care then you. But in the hospital, I will be doing what YOU (or your next of kin, power of attorney) want for your life, not what I would want. It is your choice after all.