Two different pregnancies here ...

DS1 - no morning sickness at all; didn't really show (or need maternity clothes) till probably 16 weeks - maybe a week or two later, had gestational diabetes. Generally a healthy and happy pregnancy.

DS2 - felt like crud with morning sickness, showed at about 10 weeks - maybe a week or two earlier , no gestational diabetes. I also suffered endless head colds, coughs and bouts of gastro compliments of DS1 being in daycare! Definitely having a toddler to run around after meant that when I was tired I couldn't sleep or rest when I wanted ... and the hypnobirthing prep was far more sporadic (and less of it!)

The one thing that was definitely the same with both pgs was the awful reflux I had!

I've never found BH to be painful, and couldn't say if they happened earlier with DS2 but were certainly no more intense. No leaking boobs while pg with either son.