I’m not going to lie, after I had to ask someone to climb through my car and drive it forward so I could get in, I’ve started using them at supermarkets. I’m only 20 weeks but struggle to get in and out of some spaces already because the bays are so small. I know some places say they are for parents and children, others include expectant parents in their signage. My little googling search says that it’s mostly down to the discretion of whoever owns the land, so might be worth looking online to see what different places say. I think if you’re noticeably pregnant and struggling, someone would have to be really unkind to make a problem!
Technically you are with child so yes if you need to.
I did with my first pregnancy towards the end when I genuinely couldn't get out the door without opening it fully! Now have a toddler so can use them anyway 😊. As a mum I would 100% be ok with you using them for the reason you mentioned x
Very interesting question ☺️