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I'd probably like the three month definition you mentioned better as it would mean each trimester is actually just 12.85 weeks (90 days) And by that definition I could have counted myself in the third tri at 25.7 weeks.
Haha well...3 months is actually 13 weeks on average (52 weeks per year/4) so maybe 26 weeks if you count from the start of your cycle but that could make third tri really long!