Hi Gina,
One of the major concerns about antidepressants in pregnancy is the recent discovery that women who discontinue their antidepressant meds during pregnancy are more likely to suffer a relapse of major depression. This is a link to an article published in Feb 2006 in the Journal of the American Med Assoc. that describes the study that was done:
http://www.ncbi.nlm.nih.gov/entrez/q...=pubmed_docsum
They found that 26% of women who stayed on their meds during their pg had a relapse, and 68% of women who discontinued their meds suffered a relapse. Unfortunately the abstract in the link doesn't talk about when the women stopped (what trimester, etc), if they were weaned off or went cold turkey, and whether they were under a doctor's supervision for depression. The study only assessed the women every month, it wasn't actively trying to treat the women.
The concerns with Paxil are that it's manufacturer has discovered that women who take it during the first tri have a greater chance of having a baby with major birth defects. It's about a 1% increase (4% vs. 3%), but any increase is bad to a woman who is TTC!
There isn't a lot of information about Effexor and pregnancy. If it isn't safe to take in the third tri, it's probably because it passes through the placenta. If you can't take it in the third tri, you probably can't take it while your'e breastfeeding, if you decide to do that.
To make a long story short, it sounds like your doctor is aware you are TTC. I would ask him if there was a specific reason he chose that med, given that there isn't a lot of info about it and pg. And I would ask why he didn't choose other meds. He might have some really good reasons that he just didn't tell you.
As long as your doc and your ob both know that you're pg, and you're on meds and have a plan to treat you, I think it's probably safe to take something while pg. I went throuh a major depression about 6 years ago, and I couldn't imagine trying to deal with that and pg at the same time, so treatment is so important. I also try to keep an eye on my mental state at all times, but especially when I'm experiencing a big change in my life because that's when I'm most vulnerable.
Good luck and let us know what your doc says.