I thought I was 20 weeks pregnant as of today/tomorrow but when I looked through my paperwork today after the 20 week scan it said the "gestationl age" of the baby is 21 weeks and 6 days so does that mean I'm actually 22 weeks or are they basing that on the 1st day of my last period which was 7th August? I thought I knew my dates, but maybe I am further along the line than I realised?!