I would always offer my seat to someone in more need than myself when I used public transport. Even when I was in high school and we would be the first on the bus, half way through the trip it would get full and we would offer our seats up

Last year though when I went to Melbourne, I noticed there was a big difference in the etiquette some people had towards a pregnant woman. I was obviously pregnant - 7months - and whilst catching the trams I found that I was more often than not offered a seat. A few guys even got up and insisted I sit because of how crowded it was. BUT, I found that when there was a lot of international tourists on the trams, I was not offered a seat, even when it was obvious I was struggling to stay upright. **DISCLAIMER - I'm not saying all international tourists are like this, but it was my experience**