Irrespective of the AENA guidelines, it should be remembered that the highest chance of a miscarriage is in the first 12 weeks (when you don't show).
I remember when the rule was first introduced in our league and that was because a player sox months pregnant was knocked over and she lost the baby (and the chance of having any more).
Different leagues have different rules. I umpired until I was 26 weeks - so best check with your local league.
Happy pregnancy !
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