i agree with "wear what you usally wear".

i have NEVER in my whole life, worn a bikini (due to body image stuff - my mum put me down about my body my entire life). So when pregnant, i went and bought a maternity tankini - which is the closest i have ever gotten to wearing a bikini - i had a weekly pregnancy hydrotherapy class to go to - felt great in it.

but if i was normally a wearer of bikinis, then i would have worn similar to what you are wearing to swim in.

Every time i go to a public swimming pool/beach now, i see pregnant women in all sorts of swimwear, including bikinis, so i think what you're doing sounds very normal.

I do think back in your mum's day, there was a huge societal pressure for women not even to be seen in public, whilst pregnant or breastfeeding. I wonder if that generation are a bit jealous, that it's very acceptable for pregnant women to be seen in society now, and in fact, embraced. e.g if you're feeling fit and well, carry on as normal.

your mum sounds like the one with an issue, and a bit out of touch with what is happening these days. i'm 10 years younger than your mum.

she seems to have the attitude of "hide the bump", whereas now - it's really "do what you feel comfortable doing". Most maternity fashion celebrates the bump, rather than hides it (now). I wore loose stuff, cos i wear loose stuff when NOT pregnant. i know plenty who wore firm fitting clothing, cos that's what they normally wear. (and i prolly would have too, if not brainwashed - by my mum - how awful my body was - as a teen - which stays with me now.

i went thru pregnancy and having a newborn - without a mother in my life - sometimes i have read and heard alot about grandmothers saying things that really upset new mums (like you) and it makes me think, maybe going thru all this WITHOUT my mum on board, has had some advantages.

i hope this comment of your mum's, is in the minority, and that most of the time she is supportive of your pregnancy.