I had my 12 week scan today and based on my last period I would be 12+3... at my scan today they did the measurements 8 times and are convinced I am actually 13+6!! How is this possible?? This is 10 full days difference.. meaning I would have gotten pregnant on cycle day 4! I still had my period then so I wouldn’t have been doing anything at this early stage of the month!! Has this happened to anyone else? Does it even matter if it’s a few days out?? Is it possible to have a fast growing baby??