When I went for my midwife appointment at 8 weeks they worked out my due date from my last period. However when I was 7w1d I had a scan and they said I was 7w5d so which do I go off? I know it's only a few days but I like to celebrate getting to the next week - which was every Tuesday but from my scan date would be Friday! Also my 12 week scan has been booked and off my previous scan I would be exactly 12 weeks but from last period I would be 11w3d. So which to go from? 7 week scan or date of last period