well the weeks start from the day of your last period
so I m assuming you conceived around February...
Due Date 12/3/2007 Conception 3/12/2007
Pregnancy Test 3/26/2007 1st Heartbeat 4/9/2007
Quickening 7/2/2007 Viability 8/13/2007
Week 1 3/5/2007 Week 22 7/30/2007
Week 2 3/12/2007 Week 23 8/6/2007
Week 3 3/19/2007 Week 24 8/13/2007
Week 4 3/26/2007 Week 25 8/20/2007
Week 5 4/2/2007 Week 26 8/27/2007
Week 6 4/9/2007 Week 27 9/3/2007
Week 7 4/16/2007 Week 28 9/10/2007
Week 8 4/23/2007 Week 29 9/17/2007
Week 9 4/30/2007 Week 30 9/24/2007
Week 10 5/7/2007 Week 31 10/1/2007
Week 11 5/14/2007 Week 32 10/8/2007
Week 12 5/21/2007 Week 33 10/15/2007
Week 13 5/28/2007 Week 34 10/22/2007
Week 14 6/4/2007 Week 35 10/29/2007
Week 15 6/11/2007 Week 36 11/5/2007
Week 16 6/18/2007 Week 37 11/12/2007
Week 17 6/25/2007 Week 38 11/19/2007
Week 18 7/2/2007 Week 39 11/26/2007
Week 19 7/9/2007 Week 40 12/3/2007
Week 20 7/16/2007 Week 41 12/10/2007
Week 21 7/23/2007 Week 42 12/17/2007
so you are 24 weeks :~)