I wonder if this story would have been in the news at all if it had been her boob. Or her bottom. Basically yeah, her other bumps. Because while sites such as Everyday Sexism does demonstrate that inappropriate touching of legs, boobs and bums still happens, uh, everyday the very small consolation is that usually, upon telling the story, people will acknowledge that this is bad behaviour.
A pregnant woman is likely to find herself relating a story of someone touching her bump without consent to someone touching her bump without her consent. Or questioning her decision to have that small glass of wine ('are you sure? I wouldn't, just if anything happened I'd always wonder...') or piece of cheese ('really? Cheese? You're sure?') or seafood ('oh I draw the line there, no seafood for you').
If you are a passer-by you do not bound up to the woman and administer pats and suggestions.
It's important we are understanding of pregnant women, making allowances such as giving up your seat duringimportant debates or or on public transport, that's offering help. If she's potentially harming herself and/or the foetus and you're medically responsible for her you might comment. Family might worry.
If you are a passer-by you do not bound up to the woman and administer pats and suggestions. Because the rule is whether carrying new life or not a woman is not a vessel, she's a person and she might not ask for permission to slap you.