SafeFetus: http://safefetus.com/DrugDetail.asp?DrugId=141&TradeName=Effexor%20XR&TradeId=4885 Concerns about medications etc whether it's over the counter, store bought or prescription.
Pregnancy.org: http://www.pregnancy.org/ Is a great site for information and resources.
Baby Center.ca or .com http://www.babycenter.ca/pregnancy is a wonderful site I found it really helpful. A ton of good articles, forums, pregnancy calendars etc.
Pregnancy Info: http://www.pregnancy-info.net/ Another great information site
Fetal Development: http://www.babycenter.com/100_fetal-development_5214615.bc All week to week development of your baby...
Understand Miscarriage: http://www.babycenter.ca/pregnancy/griefandloss/understandingmiscarriage/ Information for those whose been through it (like myself), to get a better understanding about why they happen etc.
Feel free to add any that have been helpful to you.
List will be updated here and there.