Ugh people always have something to say. I'm much bigger this time round, I'm 22+4 and I only started to look pregnant with DS at about 22 weeks whereas I've looked pregnant for ages! Even well meaning people in work have said the wrong thing. I feel huge but I'm taking weekly bumpiest and I don't actually look loads bigger now compared to how I look at 18 weeks! I think I just popped early so I'm still ahead, hoping it evens out.
I do think it depends on your figure too. I'm fairly slim when not pregnant with small boobs, and my bump is much less noticeable than a friend who's at the same stage with her second, who has a wider frame and huge boobs. Her boobs are still bigger than her bump!