Lou Lou,
If this is true, then according to a pregnancy calendar your conception date was before the 10th of February...right before. see below
First day of last period 1/26/2007
Due Date 11/2/2007 Conception 2/9/2007
Pregnancy Test 2/23/2007 1st Heartbeat 3/9/2007
Quickening 6/1/2007 Viability 7/13/2007
Does this make sense to you?