+1 for buying maternity jeans early. Only got mine at 15 weeks and wish I'd bought them sooner. I couldn't wear any of the fitted stuff in my wardrobe from 8-9 weeks but only started having a real bump at 15-16 weeks. (First pregnancy) It still depends a lot on what clothes I wear - only need to be slightly baggy and lots of people still say they can't tell whereas to me and DH it's really obvious now at 17 wks.