The first trimester is prior to 14 weeks, except that Casey allowed essentially unfettered abortions.
That said, there are also each personal, reasonable, and political standards. All of those are 15 weeks or less.
Relatively few people agree with either barring all abortions, or allowing full-term abortions. The best range is the one which sustainably minimized abortions. Politically, this is generally within the 6w to 15w range, in many places closer to the lower end of that range.
Having limits after 15w as being doable, but insisting on 0 weeks, gets you 40 weeks in the current environment. Politicians should set the limit to where the people are, then work on convincing them to lower it.
Only a politician could come up with 14 as a trimester.
9 months X 4 is 36 weeks. Divided by three is 12.
12, 14, 15...tomato, tomato, let’s call the whole thing off!
😉