YANBU
I nearly got pushed onto the train tracks heading home from work at the 5pm rush. Seriously. A woman shoved past me (I was at the end of the slow moving single line queue of people trying to get along the platform since it was MOBBED) and she fecking PUSHED past me. I too was not obviously pregnant from the back but was about to go on mat leave, highly emotional and HATED the rush hour commute into and out of the city.
She had a square go at me for holding her up then noticed my bump and started on at me saying she "could say much worse" to me but was "trying to be nice" as I do look quite young for my age (in a red cheeked 12 yr old way rather than anything else) so I reckon she pushed me, realised I was pregnant then chose to defend her pushing me by assuming LOUDLY that I was an underage mother or something equally as non PC!
Anyway, I seldom got a seat and would get jostled about when people try n get off at each stop n was constanly huddled round my bump trying to avoid the handles on the seats, people's umbrella's, seat corners, ticket inspectors, ELBOWS and such like.
YANBU. People are just selfish twats. I got the argument of "well, we all pay for our seats" but so did I as a regular commuter and seldom got a seat. When late stages of pregnancy, I nearly passed out from the heat and a few times people offered me a seat and I gladly took it. Sometimes other commuters tried to take the seat the person was offering as I was standing 3 people away and they would just see an opening n try to dive on in there.
No, you may not be ill but ur vital organs are squashed to a minute percentage of the original size, you have likely had a hard day and would not choose to travel rush hour at the best of times unless you are forced to ie get home before 8pm...
Ask politely if someone is willing to give up their seat and there maybe someone kind enough to do it. I never asked and lots of other standing passengers just gave me the "just ask!!!" eyes or the "Awww... you poor thing" eyes while the seated one's avoided eye contact at all costs.
Also, the trains these days go so bloody fast that you are thrown about like a rag doll n it is already impossible to stay upright when you have a humungous belly you are trying desperately to protect.