I have a problem trying to work out my concerption date. The first day of my last menstral period was from 21/07/2010 - 27/07/2010. I went to the doctor on monday the 30/08/2010 and the scan says im 4 weeks pregnant. I need to know if scans are 100% correct, and would like to know more or less when i conceived. This im my first child and i want to record every moment.