silly question here..
but where exactly is the pubic bone... is it at the height of the hair line or lower?
I think it's at the hair line, have a feel around you can actually feel the bone beneath your skin.

My OB told me your uterus usually measures the same in centimetres from the top of your pelvic bone as you are in weeks. For example I am 23 weeks and my uterus is now about 23cm from the top of my pelvic bone