I started to show at 6 weeks. People at work were already asking me if I was expecting. So much for keeping it secret till 12 weeks!! I think I bought my first maternity jeans at 10 weeks, as I'd put no weight on my legs, hips or bum so didn't need a bigger size, but my tummy did!! My dad told me that my mum was exactly the same and in his kind words 'looked like a house side at 12 weeks'