People should offer a seat, that would be polite, but then again, i know my husband stands on the train every day no matter what, and says that when he offers seats to women/pg/disabled/older or elderly people, some of them get offended?

I had no problems in asking for a seat, and was never refused one. I think we just have to realise in this day and age, people are rude and won't offer, so you're not going to get one without speaking up and asking.. sucks i know, but i would rather sit down than fall over or have my stomach squashed!

This preg i haven't ever taken public transport, so haven't had to worry.