AIBU not to offer "pregnant women" a seat on public transport?

[AhhhhThatsBass]

Yesterday I was on the tube in London at rush hour. A lady with what looked to me like a very neat pregnant bump - quite hard and round was standing next to me. (I thought I could spot a slightly protruding belly button through her thin jumper, so I jumped to the conclusion that she was indeed pregnant).
Admittedly she didn't wear the badge but not every pregnant woman does.
Anyway a seat came free behind her, in my view and I offered her the seat, rather than taking it myself. She snapped at me: "I'm not pregnant!".
I was a bit mortified but more importantly, I felt bad at the thought that that might have upset her. I didn't actually mention to her that I thought she was pregnant at any point but perhaps she saw me eyeing up her stomach.
I mumbled an apology and sat down myself.
So in order to not risk this again, WIBU to just not offer any other woman a seat unless she is wearing a badge?

Always offer.
Some people don't like to ask.
it's better to offend by offering than to keep someone who needs a seat standing.

As someone with invisible disabilities who doesn't travel in London much (so haven't had chance to use the badge I've got yet) I have always really appreciated people who have offered me a seat.

I only get the offers when I have DS with me - he is 10 but is small and is often mistaken for 7 or 8. We always gratefully accept and DS will sit on my lap or stand in between my knees.

What the people who offer us seats don't know is DS has ASD and is very anxious about falling and I have EDS so I'm in a lot of pain all the time. We're both slim and look very healthy - we definitely don't look like the weakest of the bunch as it was so nicely put by a PP. When I go to London alone I don't get offered a seat and if I go with DM (late sixties) she gets offered and politely declines but says I should have it as I'm disabled.

Keep offering OP. Some people are just dicks.

Ywbu, and I say that as a woman who has been offered seats when not pregnant but has a pokey out belly! The whole tube then turns to stair, it's humiliating. Obviously you meant well, but unless a woman is rubbing her belly, got a hand on the small of her back, giving birth or wearing a badge or massive in pregnant t-shirt do not offer them a seat! On my honeymoon we went on a bot excursion and the twat boat man refused to believe I wasn't pregnant and kept laughing and saying when he thought I was due etc. That was rude, you at least meant well. Ps my belly isn't ridiculously huge by the way despite boat man!

SWBU, the correct response would've been to sit down, pat her pizza belly and think up appropriate responses to 'how many weeks?', 'do you know the sex?' type questions just in case anyone tried to engage her in conversation.

@Morphene I tend to assume it's kind and well intentioned. I might not really need it but I appreciate somebody offering. Sometimes I feel pretty much OK to stand up - definitely too OK to feel justified asking for a seat - but at the same time, it's nice to sit down if somebody offers.

The OPs experience shows why the badge is a good idea. No pregnant woman should be obliged to wear one, but it does avoid embarrassment.

I did something similar except I thought the lady looked quite elderly. Turns out she didn't agree. I felt awful and kept my head buried in my phone for the rest of the journey even though there was no signal so I couldn't read anything new anyway

Anyway, ever since then I only offer a seat if I'm really sure. The problem with offering "just in case" by standing up anyway and leaving the seat vacant is I really rather like sitting down!!

One of my uni friends had a very old-school dad and I remember him telling a group of us that this was the real reason gentlemen always traditionally offered women their seat, not because they were being 'gentlemanly' (or sexist depending on how you perceive these things) but because you never knew who might be pregnant, so all women should be offered somewhere to sit. No one was offended, and any pregnant or otherwise indisposed woman who needed a seat got one.

Obvs we don't need this system anymore as most people are happy to either ask or wear a badge, but for this reason if anyone offers me a seat I always smile and accept.

I've seen this happen before and it was mortifying for all concerned. My solution is to simply get up without saying anything and moving to either the other end of the carriage, or another carriage altogether. Works a treat.