I had my dating scan today. I was soo sure my dates were correct. I thought i was 12 weeks + 2 days but they have dated my pregnancy at 13 weeks + 3 days. My first day of my period was 10th of april. I ovulated on 22nd of april. Going by this i should be 12+ 2 so how can they date me further on when i know when i ovulated? I always have regular cycles of 28 days xx