D.W.
Check out this article today from the NY Times:
http://well.blogs.nytimes.com/2010/02/23/slow-eating-cuts...
Please keep in mind that having a child is one of the most traumatic things you can put your body through - which is why companies have to offer you a 6 week recovery period for a vaginal delivery/8 weeks for c-section before returning to work.
Alisa had some good advice, but I'd challenge her on the 1200 calories/day. Having worked with Dieticians closely over the past 10 years, few, if any, would recommend anyone be on a diet that restrictive except for people who are completely physically incapacitated.
If you lower your caloric intake to that level, your body will go into starvation mode, and you will have to remain there the rest of your life. Any excess calories beyond that will be stored as fat.
Most dieticians recommend 1800 calories for weight loss/2000 for weight maintenance based upon your metabolism.
Your best bet is to verify with your insurance if you are covered for a consult with a dietician to better understand which foods are most appropriate for weight loss, which are problematic, etc. For example: low fat almost always means high sugar, sugar free doesn't mean carb free, etc.
Almost universally, people who do Weight Watchers have the most consistent, steady and long-term results. I do not do Weight Watchers, but the people I know who have all have been successful in their goals.
Be careful with supplements: almost none are regulated by the FDA. Remember all the issues with Xenadrin/Hydroxycut the past few years and heart attacks/liver toxicity? They were considered safe because you could purchase them at reputable stores but proved to be dangerous.
Good luck with the delivery.