Hi J.,
What an exciting time, preparing to get pregnant! I would continue to do what you are doing, making healthy lifestyle changes. To be honest, that is really what matters and not so much your weight. You want to be living your best, healthiest life when you get pregnant and become a mom, it will give you the strength for motherhood.
In regards to exercise, I am a pre and postnatal exercise specialist. I also hold my Master's degree in Exercise Physiology and more importantly am a MOM :) I have a few recommendations for you. First, continue what you are doing and when you feel confident that you have made enough positive lifestyle changes, eating healthy whole foods and a consistent exercise routine, go ahead and try to get pregnant.
The guidelines for exercising while pregnant have changed since 2002. Some doctors don't keep up to date on the new ACOG guideline, so it is important as women that we are aware. http://www.acog.org/publications/patient_education/bp119.cfm
When you become pregnant, as long as there are no pregnancy complications, you can continue on your previous exercise routine. It would be most beneficial to adjust your routine to your changing body, changing needs, etc. That is where I come in :)
Stroller Strides is a phenomenal program for pre and postnatal moms. The instructors are certified to train pregnant moms and all exercises are tailored for your safety and maximum benefit. Some Stroller Strides locations also offer Fit4Baby, a program devoted entirely to the pregnant mom, no kiddos allowed! Fit4Baby not only provides a great workout but also essential education about your body during pregnancy. I can't recommend enough that you continue to exercise most, if not all, days of the week as it will help with pregnancy symptoms, preparation for labor, and help with recovery....make you Fit For Motherhood :)
You are more then welcome to contact me with any questions you may have. As with all Stroller Strides/Fit4Baby locations, your first class is free. I know at my Stroller Strides/Fit4Baby location, they are currently offering the first week free and some HUGE discounts on membership in January. See what location is closet/most convenient for you at www.strollerstrides.com.
Good luck and congrats in advance!
M. :)