This is my 6th baby, I am totally certain of the dates as there has only been one chance for me to get pregnant in many many months 
With my others at around 10 weeks ish (later with my first two) I started to feel a hard ball right down low creeping above my hairline which obviously then grew!. I have never asked but u assume (?) this is when my uterus has started to expand up a bit.
This time I can feel it starting now at 6.5 weeks. I am almost slapping myself because I think it's impossible but it's there and it's very familiar to me.
I have other symptoms mainly being really exhausted and sick but everything else is as I would expect.?
Am I crazy is that really possible?