Giving up seats in public transport

Hi mummies! I am currently 23 weeks and having a visible round belly(average body size). I like to wear body hugging dresses which makes my belly even more bigger and noticeable. However, I always find it hard for people to automatically give up seats for me (most of time people are not on the phone or sleeping, I am pretty sure they make an eye contact with me when I entered). I have hard time balancing especially on buses, mrt and I am too shy to ask for a seat. Normally my mother or my husband have to make a big fuss on how inconsiderate people are, then some will just stand and walk away. I try not to go out as much as possible even so, I will normally take grab, but once in a while I will need to run an errand and have to take public transport. Since young, I have always give up my seats to elderly and pregnant ladies that's why I am quite shock at how our society behaves now. Do mummies experiencing this as well?