Someone has to draw a line. And we know that line ISNT in the first trimester. Most likely it can be drawn safely in the 3rd.
How do we know that for sure? Name the test being given.
Did you not read the UK article I linked and pasted excerpts from?
Some doctors there, based on NEW TECHNOLOGY AND STUDIES are reducing the 24 week (3rd trimester) limit to 20 or 18 weeks. 18 weeks is 1/2 the length of a normal pregnancy, not 2/3.
In short, over time, what we know for sure has changed, which in turn has changed where we are willing to draw that line. Hence, there were millions of SENTIENT BABIES MURDERED before these new facts were known.
if we don't know for sure when sentience begins, and we only have a vague estimate on a timeline to roughly go by, then the line between murdering a sentient human being and aborting a "clump of cells" has never been correct.