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This chart is courtesy of the Pregnancy Due Date Calculator on BabyZone.com.

Your Conception Date is:
(Approximately 2 weeks before your next menstrual period)
You’re in your First Trimester (weeks 1-12)
10/31/2007
Your period of greatest risk for birth defects is:  
(5 to 10 weeks gestational age)
11/21/2007
to 12/26/2007
Your baby’s fetal organ formation begins: 11/21/2007
Your baby’s major organs have formed: 12/26/2007
Second Trimester (weeks 12-27)
Your risk of miscarriage decreases:
1/9/2008
If your baby is premature, but born after this date,
s/he has a chance to survive:
3/26/2008
Your Third Trimester begins on:
(27 – 40 weeks)
4/23/2008
Your Pregnancy Due Date is:
(40 weeks – full term)
7/23/2008
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I always wondered why some people counted pregnancy in weeks and others in months.  As in “I’m 12 weeks pregnant” or “She’s 7 months pregnant”.  It turns out that Doctors and other healthcare professionals only keep track of “weeks”.  This is from the Mayo Clinic:

It may seem strange, but the first week of your pregnancy is actually your last menstrual period before becoming pregnant.  Why is that? Doctors and other health care professionals calculate your due date by counting 40 weeks from the start of your last cycle.  That means they count your period as part of your pregnancy, even though your baby hasn’t been conceived yet.

Conception typically occurs about two weeks after the start of your last menstrual period.  When your baby arrives, it will have been about 38 weeks since he or she was conceived, but your pregnancy will have “officially” lasted 40 weeks.

So there you have it.  The mystery of “weeks” vs. “months” is solved in my mind.  For the record, I don’t use “months” anymore.  I always now say that we are “X” weeks pregnant since it is more accurate and the term “weeks” is what I see in evertyhing that I read about pregnancy.