[ralusek]

I would say question 4 and 5 could've been answered better.

4: it is common courtesy to congratulate someone who is pregnant if they are very obviously pregnant

5: unless there are less common motives unknown to us, it is very likely that Ana was quite confident that Maria was pregnant. To congratulate someone on being pregnant, when they are not, is embarrassing for all involved parties, and is most commonly only done in error.