I was on a very crowded train long distance to meet DP at his parents' for the weekend this evening, all seats taken, standing room packed. About ten minutes in I was struggling to stand and managed to get one of the priority seats as someone was leaving the train. A few minutes later I was told by a heavily pregnant woman that she needed my seat as she needed to sit down, so I explained that I also needed to sit down for medical reasons and she would have to ask someone else. She proceeded to launch into an attack about how I looked perfectly healthy and she was in her third trimester and who did I think I was to deny her a seat when she needed one. Another pregnant woman in one of the other priority seats then piped up and both had a go at me, asking who I thought I was to not give up my seat and shouting abuse at me across the train, at which point everyone else in the carriage was giving me dirty looks (although not offering to give up their own seats) so I felt I didn't have much of a choice. I couldn't stand so ended up sitting on the floor leaning against the wall for the rest of the journey. AIBU to think pregnant women aren't the only people who need a seat on trains and have no right to turf someone else in need out of theirs?