I'm so sorry for your loss, honey
My baby died around January 17 at 9 weeks, but my body didn't acknowledge the miscarriage until Feb 7 at 12 weeks. I will always remember both dates; I use Feb 7 as the date of my loss, because that's when it was confirmed.
However, the only belly pictures that I could keep were from up to 9 weeks. In the end, it's a personal choice, and only you can determine what feels right for you. *HUGS*